Correct Answer: A

Rationale: The correct answer is A: A hemolytic reaction to mismatched blood. Chills, dyspnea, and urticaria are indicative of a hemolytic transfusion reaction, which occurs when the recipient's immune system attacks the donor's red blood cells. This can lead to various symptoms, including fever, chills, difficulty breathing, and hives. This type of reaction is most commonly seen with mismatched blood types. Option B (A hemolytic reaction to Rh-incompatible blood) is incorrect because Rh incompatibility typically leads to hemolytic disease of the newborn, not an immediate transfusion reaction. Option C (A hemolytic allergic reaction caused by bacterial contamination of donor blood) is incorrect as bacterial contamination would present with symptoms such as fever and sepsis, not chills, dyspnea, and urticaria. Option D (None of the above) is incorrect as the symptoms presented align with a hemolytic transfusion reaction.

Correct Answer: D

Rationale: The correct answer is D: Whisper voice test. This test is used as an initial screening for hearing loss because it is simple, quick, and easily administered by a nurse. The nurse would whisper words or numbers at a specific distance from the patient to assess their ability to hear and repeat the whispered sounds accurately. This test provides a quick indication of potential hearing impairment. The other choices are incorrect: A: Romberg test assesses balance and not hearing. B: Caloric test evaluates the vestibular system, not hearing. C: Otoscopic examination is used to examine the ear canal and tympanic membrane, not to screen for hearing loss.

Correct Answer: A

Rationale: The correct answer is A because compromised nutrition can lead to deficiencies in essential nutrients required for the production of blood cells and hemoglobin. Iron, vitamins, and minerals obtained from food are crucial for erythropoiesis and maintaining a healthy immune system. Without these nutrients, the body may struggle to produce an adequate amount of healthy red blood cells, leading to anemia and compromised immune function. Choice B is incorrect because excessive fat in the diet is not directly linked to interfering with the production of blood cells and hemoglobin. Choice C is incorrect as inconsistent dieting may affect overall health but is not specifically related to hematopoiesis. Choice D is incorrect because while iron and protein are important for blood cell production, excessive amounts of these elements are unlikely to interfere with the production of blood cells and hemoglobin.

Correct Answer: A

Rationale: The correct answer is A: Levodopa. Levodopa is the most effective pharmacologic agent for Parkinson's disease as it is converted to dopamine in the brain, replenishing dopamine levels which are depleted in Parkinson's. Selegiline and Symmetrel provide symptomatic relief but are not as effective as Levodopa. Permax is not commonly used due to its association with serious side effects like heart valve damage.

Correct Answer: D

Rationale: The correct answer is D, the bicarbonate-carbonic system. This buffer system is crucial in maintaining the body's pH balance. When CO2 combines with water in the blood, it forms carbonic acid, which dissociates into bicarbonate ions and hydrogen ions. Bicarbonate acts as a base, accepting excess hydrogen ions to prevent a decrease in pH. Hemoglobin and plasma proteins primarily function as transport molecules, not as buffer systems. Phosphate buffer system is present in intracellular fluids, not as commonly in the body. The bicarbonate-carbonic system is the most prevalent buffer system in the blood and plays a vital role in regulating blood pH.