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
Drug of choice to relieve pain in myocardial infarction- 
Select and explain. 
A. Morphine, B. Fortwin, C. Diazepam, D. NSAID
A: Morphine
Answer: A: Morphine 
Explanation: None