Correct Answer: B

Rationale: The correct answer is B. This statement shows an understanding of reducing HIV transmission by promoting harm reduction strategies like needle exchange programs, which help prevent sharing of contaminated needles. This approach is evidence-based and effective in reducing the spread of HIV among injection drug users. Choice A is incorrect because breastfeeding by HIV-positive mothers can transmit the virus to infants. Choice C is incorrect as birth control pills do not protect against HIV, only against pregnancy. Choice D is incorrect as natural skin condoms do not provide the same level of protection against HIV as latex condoms do.

Correct Answer: B

Rationale: The correct answer is B: Efferent. Efferent neurons transmit signals from the central nervous system to muscles and glands, controlling movement and secretion. Afferent neurons carry signals from sensory receptors to the central nervous system, not towards muscles or glands. "Affective" relates to emotions, not neural function. "Effective" does not describe the direction of signal transmission in the nervous system. Therefore, B is the correct choice.

Correct Answer: C

Rationale: Step 1: The optimal suctioning pressure for adults is usually between 80-120 mmHg. Step 2: Choice C falls within this recommended range (95-110 mmHg). Step 3: Higher pressures (like in choices B and D) can cause tissue damage. Step 4: Lower pressures (like in choice A) may not effectively remove secretions. Summary: Choice C (95-110 mmHg) is correct as it falls within the safe and effective suctioning pressure range for adults, while the other choices are either too high or too low, risking harm or inefficiency.

Correct Answer: B

Rationale: Step 1: High cholesterol levels contribute to the buildup of plaque in arteries, leading to atherosclerosis and increasing the risk of coronary artery disease. Step 2: Atherosclerosis can result in a blockage of blood flow to the heart, causing a myocardial infarction (MI). Step 3: Age is a risk factor for CAD but not directly linked to MI development. Step 4: Medication usage may impact risk factors but is not a direct cause of MI. Step 5: Gender can influence risk but is not the primary factor in MI development.

Correct Answer: A

Rationale: The correct answer is A: The sympathetic nervous system saves fluid in response to the stress of surgery. The sympathetic nervous system is responsible for the "fight or flight" response, which includes the conservation of fluids during stressful situations. Dark amber and concentrated urine indicates dehydration, which can be a result of the sympathetic nervous system conserving fluids. B: The sympathetic nervous system does not "diereses" (increase urination) in response to stress. C: The parasympathetic nervous system is not involved in fluid conservation during stress. D: The parasympathetic nervous system does not "diereses" fluid in response to stress.