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': 'Drugs used in unstable angina are all except ? \nSelect and explain. \nA. Intravenous heparin, B. Aspirin, C. Intravenous nitroglycerin, D. Lidocaine by bolus infusion', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Lidocaine by bolus infusion", 'role': 'assistant'}]