Pick out the sympatholythic drug:

Correct Answer: C

Rationale: The correct answer is C: Guanethidine. Guanethidine is a sympatholytic drug that blocks the release of norepinephrine from sympathetic nerve terminals, thus reducing sympathetic activity. This leads to a decrease in blood pressure. A: Labetalol is a non-selective beta blocker with alpha-blocking activity. B: Prazosin is an alpha-1 adrenergic receptor antagonist. D: Clonidine is a centrally acting alpha-2 adrenergic agonist. Therefore, the correct choice for a sympatholytic drug is Guanethidine due to its mechanism of action in inhibiting sympathetic activity.

Correct Answer: C

Rationale: The correct answer is C: Crystalline insulin. Diabetic coma is a severe complication of diabetes characterized by extremely high blood sugar levels. Administration of crystalline insulin helps lower blood sugar rapidly. Lente insulin (A) is not fast-acting enough for diabetic coma treatment. Glucose (B) would further elevate blood sugar levels. Oral anti-diabetic drugs (D) are not suitable for immediate treatment of diabetic coma.

Correct Answer: A

Rationale: Prednisolone is the correct answer because it does not contain any fluoride atoms in its chemical structure. Prednisolone is a synthetic corticosteroid that lacks fluorine atoms, making it safer for long-term use compared to other glucocorticoids like dexamethasone, fluocinolone, and triamcinolone, which all contain fluorine atoms. Fluorine atoms in glucocorticoids can increase their potency but also lead to potential adverse effects, such as bone density loss and increased risk of fractures. Therefore, prednisolone is the safest option among the choices provided.

Correct Answer: D

Rationale: Rationale: Histamine H1 antagonists are commonly used to prevent or treat allergic reactions like rhinitis and urticaria due to their antihistaminic properties. They are also effective in managing symptoms of motion sickness and vestibular disturbances by inhibiting histamine release in the brain. Moreover, these antagonists are recommended for treating nausea and vomiting in pregnancy, commonly known as "morning sickness," as they help alleviate these symptoms by blocking histamine receptors. Therefore, the correct answer is D, as histamine H1 antagonists are indicated for all the mentioned conditions. Choices A, B, and C are incorrect as they individually do not encompass the full range of indications for histamine H1 antagonists.

Correct Answer: C

Rationale: The correct answer is C. Vitamin E is not specifically required for the synthesis of prothrombin and clotting factors. A: True. Vitamin E is a vital antioxidant protecting cell membranes from damage. B: True. Vitamin E is known for its antisterility and antiabortion properties. D: True. Vitamin E is essential for regulating oxidative processes. In summary, vitamin E does not play a direct role in the synthesis of clotting factors, making statement C incorrect.