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': 'Antibiotic prophylaxis is a must in: \nSelect and explain. \nA. Angina pectoris, B. Infective endocarditis, C. Pulmonary embolism, D. Before all minor surgeries', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]