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': 'Praterm baby is \nSelect and explain. \nA. Babies born before the end of 30 weeks, B. Babies born before the end of 37 weeks, C. Babies born before the end of 38 weeks, D. Babies born at completion of 42 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]