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: Medicine
A 70 yrs pt. is refusing for angiography but he has an episode of chest pain on walking upstairs not progressed for last 4 year what shall be done in this patienta) Aspirin lowdose givenb) Nitroglycerine sublingual before walking upstairsc) Continue exercise even after chest paind) Stop exercise if chest pains 
Select and explain. 
A. ab, B. a, C. ad, D. bc
A: ab
Answer: A: ab 
Explanation: None