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
Side effect of salmeterol is- 
Select and explain. 
A. Tremor, B. Seizure, C. Hypeension, D. Hyperkalaemia
A: Tremor
Answer: A: Tremor 
Explanation: Ans. is 'a' i.e., 'tremor o Tremor and palpitations are most common side effects.