Correct Answer: B

Rationale: The correct answer is B: Turn on the affected side. This position helps to promote the closure of the puncture site in the lung, reducing the risk of fluid leakage and pneumothorax. Placing the client flat in bed (A) may not allow gravity to assist in the closure of the puncture site. Turning on the unaffected side (C) may not effectively prevent fluid leakage from the puncture site. Bed rest (D) is a general instruction and does not specifically address the prevention of fluid leakage after thoracentesis.

Correct Answer: C

Rationale: The correct answer is C: "Take zidovudine every 4 hours around the clock." Zidovudine is an antiretroviral medication used to treat HIV/AIDS. It is crucial for the client to adhere to the prescribed dosing schedule to maintain therapeutic blood levels. Taking the medication every 4 hours around the clock helps to ensure consistent levels in the body, maximizing its efficacy. Taking it with meals (choice A) or on an empty stomach (choice B) is not specifically indicated for zidovudine. Choice D is incorrect as taking OTC drugs without consulting a healthcare provider can lead to drug interactions or adverse effects. Hence, choice C is the most appropriate instruction to ensure the client benefits from the medication.

Correct Answer: D

Rationale: The correct answer is D: leukocytosis. Carbamazepine can cause bone marrow suppression, leading to leukocytosis. Monitoring for elevated white blood cell count is essential to detect this potential complication early. A: Adult respiratory distress syndrome is not a common complication of carbamazepine. B: Elevated levels of phenytoin is not a direct complication of carbamazepine use. C: Diplopia is a common side effect of carbamazepine, not a potential complication like leukocytosis.

Correct Answer: D

Rationale: The correct answer is D, assess vital signs, as it is crucial to monitor the client's hemodynamic stability and response to treatment during the critical initial 24 hours of Addisonian crisis. Vital signs such as blood pressure, heart rate, and respiratory rate provide valuable information about the client's condition and response to therapy. Weighing the client (choice A) and testing urine for ketones (choice C) may be important but not as immediately critical as monitoring vital signs. Administering oral hydrocortisone (choice B) is essential for treatment but does not require frequent administration within the first 24 hours.

Correct Answer: C

Rationale: The correct answer is C: Bone marrow. Blood cells are primarily formed in the bone marrow through a process called hematopoiesis. The bone marrow contains stem cells that differentiate into various types of blood cells, including red blood cells, white blood cells, and platelets. Arterioles are small blood vessels that carry blood away from the heart, not involved in blood cell formation. Lymphoid tissue plays a role in immune function but not in blood cell production. Muscle tissue is primarily responsible for movement and does not have a role in blood cell formation. Therefore, the bone marrow is the correct answer as it is the main site of blood cell production in the body.