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: Medicine
[{'content': 'All are used in bronchial asthma, except : \nSelect and explain. \nA. Salbutamol, B. Morphine, C. Aminophylline, D. Steroid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer is B (Morphine) Morphine is contraindicated in asthma because it causes constriction of bronchial muscle by causing histamine release.', 'role': 'assistant'}]