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 used for - \nSelect and explain. \nA. Treating urinary retention, B. Treating ileus, C. Increasing salivation, D. Treating Asthma', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Treating Asthma o Ipratropium and tiotropium are anticholinergic bronchodilators.", 'role': 'assistant'}]