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
The drug not used in acute asthma is : 
Select and explain. 
A. Salbutamol, B. Ipratropium, C. Montelukast, D. Hydrocortisone
C: Montelukast
Answer: C: Montelukast 
Explanation: Only bronchodilator drugs are useful for the treatment of an acute attack of asthma. Main drugs are:
Beta 2 agonists e.g. salbutamol, terbutaline
Anticholinergics e.g. ipratropium, tiotropium
Methylxanthines e.g. theophylline
Other drugs used for asthma (like mast cell stabilizers, leukotriene receptor antagonists and lipoxygenase inhibitors) are indicated only for prophylaxis.