This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Pharmacology
[{'content': 'A person taking tricyclic antidepressants presents with blurred vision and dry mouth. These adverse effects result due to blockade of: \nSelect and explain. \nA. M3 muscarinic receptors, B. GABAA receptors, C. H1 histamine receptors, D. 5HT2 receptors', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A) M3 muscarinic receptors(Ref: KDT 8/e p486)Anticholinergic adverse effects of TCAs include dry mouth, constipation, blurring of vision, urinary retention, etc.', 'role': 'assistant'}]