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: Dental
[{'content': 'Elective endodontic treatment is contraindicated in \nSelect and explain. \nA. Angina patients, B. Recent MI, C. Diabetes, D. Hypertension', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]