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
All of the given drugs may be useful in acute exacerbation of bronchial asthma EXCEPT 
Select and explain. 
A. Cromolyn sodium, B. Hydrocortisone, C. Salbutamol, D. Ipratropium
D: Ipratropium
Answer: D: Ipratropium 
Explanation: None