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: Surgery
[{'content': 'Puerperal tetanus refers to: \nSelect and explain. \nA. A complication of narcotic addiction, B. Result from unsterile instrumentation during labour, C. After months or years, Cl.tetani again multiply and cause disease, D. It is also known as tetanus neonatorum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: It\xa0is also known as Post abortal tetanus.', 'role': 'assistant'}]