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': 'Which of the following is a long acting M3 - antagonist used for bronchial asthma \nSelect and explain. \nA. Ipratropium, B. Glycopyrolate, C. Cromoglycate, D. Tiotropium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Tiotropium and umiclidinium are longer acting M3-antagonists used in bronchial asthma.', 'role': 'assistant'}]