Folic acid is recommended for treatment of megaloblastic anemia. This statement is:

Correct Answer: A

Rationale: Step-by-step rationale: 1. Folic acid is essential for DNA synthesis, crucial for red blood cell formation. 2. Megaloblastic anemia is characterized by large, immature red blood cells. 3. Folic acid deficiency can lead to megaloblastic anemia. 4. Therefore, folic acid supplementation is recommended for treating megaloblastic anemia. Summary: - Choice A is correct because folic acid is recommended for treating megaloblastic anemia due to its role in red blood cell formation. - Choice B is incorrect because folic acid is indeed recommended for megaloblastic anemia treatment. - Choice C is incorrect as it implies all choices are correct, which is not the case. - Choice D is incorrect as folic acid is recommended for megaloblastic anemia treatment.

Correct Answer: D

Rationale: The correct answer is D: Minoxidil. Minoxidil is a direct-acting vasodilator, not a central-acting antihypertensive drug. Central-acting antihypertensive drugs like Methyldopa, Clonidine, and Moxonidine work by acting on the central nervous system to reduce sympathetic outflow, thereby lowering blood pressure. Minoxidil, on the other hand, works by directly relaxing smooth muscle cells in blood vessels, leading to vasodilation and reduced blood pressure. So, Minoxidil does not belong to the category of central-acting antihypertensive drugs.

Correct Answer: A

Rationale: The correct answer is A because vinpocetine is known to dilate cerebral vessels, leading to improved blood supply to the brain. This mechanism of action helps enhance cerebral circulation and oxygen delivery, thereby potentially improving cognitive function. Choice B is incorrect because vinpocetine does not constrict cerebral vessels and decrease blood supply. Choice C is incorrect as vinpocetine does not directly stimulate GABA-receptors to increase cerebral metabolic processes. Choice D is incorrect as vinpocetine does not constrict peripheral vessels and increase blood pressure.

Correct Answer: C

Rationale: The correct answer is C because human insulin can be given to patients who have an allergy to animal insulins. This is crucial as some patients may develop allergic reactions to animal insulins, making it unsafe for them to use. Human insulin, being a synthetic form, is less likely to trigger allergies in such patients. The other choices, A, B, and D, are incorrect as they do not address the primary reason for prescribing human insulin, which is the specific need for patients with allergies to animal insulins.

Correct Answer: B

Rationale: The correct answer is B: Fluocinolone. This glucocorticoid has one fluoride atom in its chemical structure, making it the only option that fits the criteria. Prednisolone (A) does not contain any fluoride atoms. Triamcinolone (C) also does not have a fluoride atom. Option D is incorrect because only Fluocinolone (B) has the specific chemical structure with one fluoride atom. Thus, B is the correct answer.