This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Dry mouth during antidepressant therapy is caused by blockade of - \nSelect and explain. \nA. Muscarinic acetylcholine receptors, B. Serotonergic receptors, C. Dopaminergic receptors, D. GABA receptors', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Muscarinic acetylcholine receptors "Blurred vision, dry mouth, urinary hesitancy or retention, and constipation represent the most common antimuscarinic complaints".', 'role': 'assistant'}]