Indicate an effective antidepressant with minimal autonomic toxicity:

Correct Answer: B

Rationale: The correct answer is B: Fluoxetine. Fluoxetine is a Selective Serotonin Reuptake Inhibitor (SSRI) with minimal autonomic toxicity compared to tricyclic antidepressants like Amitriptyline (A), Imipramine (C), and Doxepin (D). SSRIs have a more favorable side effect profile with reduced risk of anticholinergic effects, orthostatic hypotension, and cardiac toxicity. Fluoxetine specifically has a lower affinity for muscarinic, histaminic, and alpha-adrenergic receptors, reducing autonomic side effects. Amitriptyline, Imipramine, and Doxepin are tricyclic antidepressants that have stronger anticholinergic and sedative effects, leading to more autonomic toxicity.

Correct Answer: B

Rationale: The correct answer is B: LSD. Hallucinogens are a class of drugs that alter perception, thoughts, and feelings. LSD, also known as acid, is a well-known hallucinogen that causes visual and auditory hallucinations. Heroin (A) is an opioid, Cocaine (C) is a stimulant, and Opium (D) is an opioid, none of which belong to the hallucinogen category. Therefore, B is the correct answer as it is the only drug related to hallucinogens among the choices provided.

Correct Answer: B

Rationale: The correct answer is B: Ephedrine. Ephedrine is a sympathomimetic drug that acts by stimulating alpha and beta-adrenergic receptors, leading to bronchodilation. Isoprenaline (A) is a non-selective beta-adrenergic agonist. Atropine (C) is an anticholinergic drug that inhibits parasympathetic activity. Salbutamol (D) is a selective beta2-adrenergic agonist commonly used as a bronchodilator. Therefore, the correct choice for a bronchodilator drug belonging to sympathomimetics is Ephedrine.

Correct Answer: C

Rationale: The correct answer is C: Ascorbic acid. Ascorbic acid enhances the absorption of non-heme iron by reducing it to a more absorbable form. This helps increase the uptake of iron in the intestine. Cyanocobalamin (A) is Vitamin B12, not involved in iron absorption. Folic acid (B) is essential for DNA synthesis but does not directly affect iron absorption. Erythropoietin (D) is a hormone that stimulates red blood cell production, but it does not impact iron absorption.

Correct Answer: B

Rationale: The correct answer is B: Milrinone. Milrinone inhibits type III cyclic nucleotide phosphodiesterase, leading to increased levels of cyclic AMP in cardiac and smooth muscle cells, resulting in positive inotropic and vasodilatory effects. Amiodarone (A) is an antiarrhythmic drug. Propranolol (C) is a beta-blocker. Enalapril (D) is an ACE inhibitor. These drugs do not inhibit type III cyclic nucleotide phosphodiesterase.