This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': "Wellen's syndrome suggests \nSelect and explain. \nA. Stable angina, B. Unstable angina, C. Lugwig's angina, D. Prinzmetal angina", 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]