Correct Answer: D

Rationale: The correct answer is D: Duodenum. The duodenum is the first part of the small intestine where most of the digestion and absorption of nutrients occurs. It receives partially digested food from the stomach and mixes it with bile and pancreatic enzymes to break down nutrients. The villi in the duodenum increase the surface area for absorption. The other choices (A: Ileum, B: Cecum, C: Stomach) are incorrect because the ileum and cecum are parts of the small intestine where some absorption occurs but not as much as in the duodenum. The stomach primarily digests food and does not absorb many nutrients.

Correct Answer: A

Rationale: The correct answer is A: Rinsing the ears with normal saline after swimming. This is because rinsing with normal saline helps to remove excess moisture and debris, preventing bacterial growth that can lead to otitis externa. Avoiding loud noises (B) is important for overall ear health but does not specifically prevent otitis externa. Instilling antibiotic ointments regularly (C) is not recommended as it can disrupt the ear's natural flora. Avoiding cotton swabs (D) is important to prevent injury but does not directly prevent otitis externa.

Correct Answer: D

Rationale: The correct answer is D because a dyspneic patient with a tracheostomy may have difficulty speaking due to impaired airflow and mobility of the tongue. In this case, using alternative communication methods such as writing or using communication boards would be more effective. Choice A is incorrect because being blind does not directly impact communication in this scenario. Choice B is incorrect as hunger, alertness, and self-esteem do not relate to the communication challenges presented. Choice C is incorrect as depression, while important to consider, is not the primary factor impacting communication in this case.

Correct Answer: A

Rationale: The correct answer is A: Rate of growth. Malignant cancer cells grow and divide rapidly compared to benign cells. Benign cells are usually slow-growing and have a well-defined border, while malignant cells grow uncontrollably and invade surrounding tissues. The other choices are incorrect because: B: Ability to cause death - Both benign and malignant cells have the potential to cause harm, but the key difference lies in their growth rate and invasiveness. C: Size of cells - The size of cells does not necessarily differentiate between benign and malignant cells. D: Cell contents - While malignant cells may have abnormal cell contents, this is not a defining characteristic when differentiating between benign and malignant cells. E: Ability to spread - While the ability to spread is a key characteristic of malignant cells, the primary differentiating factor in this question is the rate of growth.

Correct Answer: D

Rationale: The correct answer is D, marginal. Placenta previa is classified based on the proximity of the placental edge to the internal os. In a marginal placenta previa, the placental edge just reaches the internal os. This is a crucial distinction as it poses a higher risk for bleeding during labor. Total placenta previa covers the entire internal os, partial placenta previa partially covers the internal os, and low-lying placenta is when the placenta is close to but not covering the internal os. Therefore, D is correct as it accurately describes the specific position of the placenta edge in relation to the internal os in cases of marginal placenta previa.