This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Tiotropium is contra-indicated in: \nSelect and explain. \nA. Bronchial asthma., B. Urinary retention., C. Hypertension., D. All of the above.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Antimuscarinic drugs are contraindicated in glaucoma and BHP(urinary retention)', 'role': 'assistant'}]