This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'Urination in the human subject is decreased by \nSelect and explain. \nA. Nicotinic agonists, B. AChase inhibitors, C. muscarinic agonists, D. muscarinic antagonists', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ANTICHOLINERGIC DRUGS (Muscarinic receptor antagonists, Atropinic, Parasympatholytic) Smooth muscles:- All visceral smooth muscles that receive parasympathetic motor innervation are relaxed by atropine (M3 blockade). Tone and amplitude of contractions of stomach and intestine are reduced; the passage of chyme is slowed--constipation may occur, spasm may be relieved. Atropine has relaxant action on ureter and Urinary bladder; urinary retention can occur in older males with prostatic hyperophy. However,this relaxant action can be beneficial for increasing bladder capacity and controlling detrusor hyperreflexia in neurogenic bladder/enuresis. Ref:- kd tripathi; pg num:-114,115', 'role': 'assistant'}]