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
All are used in bronchial asthma, except : 
Select and explain. 
A. Salbutamol, B. Morphine, C. Aminophylline, D. Steroid
B: Morphine
Answer: B: Morphine 
Explanation: Answer is B (Morphine) Morphine is contraindicated in asthma because it causes constriction of bronchial muscle by causing histamine release.