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
Efficacy of salmeterol is increased if it is given along with - 
Select and explain. 
A. Theophylline, B. Coicosteroid, C. Ipratropium, D. Sodium cromoglycate
B: Coicosteroid
Answer: B: Coicosteroid 
Explanation: Ans. is 'b' i.e., Coicosteroid o Concurrent use of inhaled salmeterol with inhaled glucocoicoid produces effects equivalent to double dose of the coicoid alone.