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': 'Only nitrate not undergoing first pass metabolism is \nSelect and explain. \nA. Nitroglycerin, B. Isosorbide dinitrate, C. Isosorbide mononitrate, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Isosorbide mononitrate does not undergo first pass metabolism.', 'role': 'assistant'}]