This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasympathetic System & Glaucoma, Subject name: Pharmacology
[{'content': 'Which of the following can be blocked by atropine, a muscarinic receptor blocker? \nSelect and explain. \nA. Increased blood pressure caused by nicotine, B. Increased skeletal muscle strength caused by neostigmine, an acetycholine esterase inhibitor, C. Bradycardia caused by infusion of acetylcholine, D. All of these', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Atropine is a muscarinic antagonist. Muscarinic antagonists competitively inhibit the effect of acetylcholine at muscarinic receptors. Bradycardia caused by infusion of acetylcholine- can be blocked by atropine', 'role': 'assistant'}]