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': 'Ipratropium bromide acts on which receptors and its use is? \nSelect and explain. \nA. M2 bronchial asthma, B. M1 Peptic ulcer, C. M3 COPD, D. Nm Asthma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ipra and tiotropium bromide are m3 receptor blockers more selective for bronchial muscle causing bronchial dilatation, so used in bronchial asthma and COPD M3 receptors are present on bronchial smooth muscle Ref: KDT 6th ed pg 113', 'role': 'assistant'}]