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: Social & Preventive Medicine
[{'content': 'Still birth rate includes babies dead after \nSelect and explain. \nA. 37 weeks, B. 28 weeks, C. 20 weeks, D. 24 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]