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
[{'content': 'Which of the following drug is associated with highest cardiac mortality ? \nSelect and explain. \nA. Rofecoxib, B. Nicorandil, C. Losartan, D. Metoprolol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]