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
Which one of the following drug is contraindicated in acute myocardial infarction: 
Select and explain. 
A. Morphine, B. Pentazocine, C. Nitroglycerin, D. Beta blockers
B: Pentazocine
Answer: B: Pentazocine 
Explanation: None