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
Advantage of salmeterol over salbutamol is its : 
Select and explain. 
A. Shorter duration of action, B. More potency, C. Longer duration of action, D. Lesser cardiac effects
C: Longer duration of action
Answer: C: Longer duration of action 
Explanation: None