Correct Answer: B

Rationale: The correct answer is B: Malignant cells contain proteins called tumor-specific antigens. Tumor-specific antigens are unique to cancer cells and are not found in normal cells. This characteristic distinguishes cancer cells from normal cells and is important in cancer detection and treatment. A: Malignant cells do not necessarily contain more fibronectin than normal body cells. Fibronectin is a glycoprotein found in the extracellular matrix and is not a defining characteristic of cancer cells. C: Chromosomes in cancer cells are actually more prone to instability and mutations compared to normal cells, making them less durable and stable. D: The nuclei of cancer cells can vary in size and shape, with irregularities often seen, rather than being unusually large and regularly shaped.

Correct Answer: A

Rationale: Step 1: Handwashing is crucial in preventing the spread of viral conjunctivitis, which is highly contagious. Step 2: Children often touch their eyes and then surfaces, aiding in disease transmission. Step 3: Educating parents and the child on proper hand hygiene can help contain the infection. Step 4: Antibiotics are not effective against viral infections, so compliance is not necessary. Step 5: Complications like meningitis and septicemia are extremely rare with viral conjunctivitis. Step 6: Surgery is not indicated for viral conjunctivitis, as it is a self-limiting condition.

Correct Answer: D

Rationale: The correct answer is D: According to current guidelines, breast conservation combined with radiation is as effective as a modified radical mastectomy. 1. Breast conservation surgery followed by radiation is a standard treatment option for early-stage breast cancer. 2. Studies have shown that breast conservation surgery combined with radiation therapy is equally effective in terms of long-term survival rates compared to mastectomy. 3. Current guidelines recommend considering breast conservation surgery as a viable option for patients with early-stage breast cancer. 4. Modified radical mastectomy is not necessarily needed to ensure complete removal of cancer, as breast conservation surgery followed by radiation can achieve the same goal. 5. Therefore, the nurse should reassure the patient's husband that the recommended treatment plan is based on current guidelines and is as effective as a modified radical mastectomy.

Correct Answer: C

Rationale: The correct answer is C: Work with the team to negotiate informed consent. In this scenario, the nurse should prioritize respecting the patient's cultural beliefs while also ensuring the patient's autonomy and right to make decisions about his own healthcare. By working with the healthcare team to negotiate informed consent, the nurse can involve both the patient and his eldest son in the decision-making process, ensuring that the patient's preferences are respected while also upholding ethical principles of patient autonomy and beneficence. This approach promotes collaboration and respect for cultural values while still safeguarding the patient's rights. Choice A is incorrect because it does not involve the patient in the decision-making process and could undermine his autonomy. Choice B is incorrect as it disregards the patient's cultural beliefs and preferences. Choice D is incorrect as it may violate the patient's right to information and involvement in his own care.

Correct Answer: A

Rationale: The correct answer is A because the cognitive effects of aging can mimic symptoms of brain tumors in older adults, leading to misdiagnosis or delayed diagnosis. Aging can also affect the presentation, progression, and treatment outcomes of brain tumors. Option B is incorrect as brain tumors in older adults can indeed produce focal effects. Option C is incorrect as not all older adults have numerous benign brain tumors, and this is not a factor affecting the diagnosis and treatment of brain tumors in this case. Option D is incorrect as age alone does not preclude treatment for brain tumors.