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
[{'content': 'The most rapid relief of symptoms of angina pectoris is found with the administration of: \nSelect and explain. \nA. Oxygen, B. Ibubrufen, C. A barbiturate, D. Nitrates', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]