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': 'Tiotropium is contraindicated in: \nSelect and explain. \nA. Bronchial asthma, B. Hypeension, C. Urinary retention, D. Peptic ulcer disease -', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ref:KD Tripathi pharmacology 7th edition (page.no: 114,115,117) Actions of Tiotropium bromide are - bronchodilatation, Decreased gastric secretion so, it's not contraindicated in peptic ulcer Tiotropium acts on M3 receptors- block them and cause urinary retention. so it is contraindicated in urinary retention.", 'role': 'assistant'}]