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
Drug of choice for classical angina attack ? 
Select and explain. 
A. CCBs, B. b-blocker, C. GTN, D. Prazocin
C: GTN
Answer: C: GTN 
Explanation: Ans. is 'c' i.e., GTN For immediate pre-exeional prophylaxis and acute attack Sublingual glyceral trinitrate (Drug of choice)