This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pharmacology
The drug not used in acute asthma is 
Select and explain. 
A. Salbutomol, B. Ipratropium, C. Montelukast, D. Hydrocoisone
C: Montelukast
Answer: C: Montelukast 
Explanation: Refer KDT 6/e p 222 Only bronchodilator drugs are useful for the treatment of acute attack of asthma Beta 2 agonists eg salbutomol, terbutaline. Antichokinergics eg Iprqtropoum, tiotropium Methylxanthine eg Theophylline