All of the following are central acting antihypertensive drugs EXCEPT:

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: 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.

Correct Answer: A

Rationale: Step-by-step rationale: 1. Diazoline contains cetirizine, a second-generation antihistamine with a long duration of action. 2. Cetirizine has a half-life of approximately 7-10 hours, providing prolonged relief. 3. Its long-acting nature makes it effective in managing allergies for up to 24-48 hours. 4. Diprazine, Suprastine, and Dimedrol do not contain cetirizine and are not known for their long duration of action. Summary: Diazoline (choice A) is the correct answer as it contains cetirizine, a long-acting antihistamine. Choices B, C, and D do not contain cetirizine and are not known for their extended duration of action.

Correct Answer: B

Rationale: The correct answer is B because keratomalacia is specifically defined as softening and subsequent ulceration and perforation of the cornea due to severe vitamin A deficiency. Choice A is incorrect as it describes xerophthalmia, not keratomalacia. Choice C describes photophobia, not keratomalacia. Choice D is incorrect as it includes all the options, but only choice B accurately defines keratomalacia.