Correct Answer: B

Rationale: The correct answer is B: The patient has a history of hypertension. Hypertension is a risk factor for erectile dysfunction as it can lead to reduced blood flow to the penis, impacting the ability to achieve and maintain an erection. High blood pressure can damage blood vessels and affect the circulation necessary for an erection. Other choices are less likely to directly contribute to erectile dysfunction. A: UTI treatment is not typically associated with erectile dysfunction. C: Age alone is not a direct cause of erectile dysfunction, although it can increase the risk. D: While a sedentary lifestyle can impact overall health, it is less likely to directly cause erectile dysfunction compared to hypertension.

Correct Answer: A

Rationale: Rationale for Correct Answer A: Stage IV breast cancer indicates distant metastasis, making the patient ineligible for curative surgery. Treatment for stage IV focuses on palliative care to manage symptoms and improve quality of life. Summary of Other Choices: B: Stage IV breast cancer is not considered highly treatable as it has spread beyond the breast and nearby lymph nodes, making it more challenging to cure. C: There is no evidence to suggest that stage IV breast cancer will self-resolve. The prognosis for metastatic breast cancer is typically poor. D: The 5-year survival rate for stage IV breast cancer is generally lower than 15%, making this choice incorrect.

Correct Answer: C

Rationale: The correct answer is C: Hydrocele. A hydrocele is the collection of fluid in the tunica vaginalis of the testes. This condition is common in newborns and can also occur in adolescents. Cryptorchidism (A) is the absence of one or both testes from the scrotum. Orchitis (B) is inflammation of the testicles. Prostatism (D) is a non-specific term related to prostate issues, not relevant to the given scenario. Therefore, the correct diagnosis for an adolescent with fluid collection in the tunica vaginalis of his testes is hydrocele.

Correct Answer: B

Rationale: Correct Answer: B Rationale: 1. Prone position post retinal detachment repair helps the gas bubble or silicone oil stay against the retina to support healing. 2. This position prevents the bubble/oil from moving and causing further detachment. 3. Repositioning can jeopardize the surgical repair and lead to complications. 4. Calling the physician (A) is unnecessary as the order is clear. 5. Instructing the patient to prevent bleeding (C) is not related to the positioning after retinal detachment repair. 6. Repositioning after the first dressing change (D) contradicts the initial order and risks complications.

Correct Answer: D

Rationale: The correct answer is D: Different molecular structure in the cells. Malignant cells have alterations in their molecular structure, leading to uncontrolled growth and invasion of surrounding tissues, while benign cells retain their normal molecular structure and do not invade nearby tissues. This distinction is crucial in understanding why malignant cells are cancerous and pose a greater risk compared to benign cells. Other choices are incorrect because: A: Slow rate of mitosis of cancer cells - Malignant cells actually have a rapid rate of mitosis, contributing to their uncontrolled growth. B: Different proteins in the cell membrane - While there may be differences in proteins, the molecular structure is a more fundamental difference between malignant and benign cells. C: Differing size of the cells - Cell size alone is not a definitive characteristic that distinguishes between malignant and benign cells; molecular structure plays a more significant role.