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: Gynaecology & Obstetrics
[{'content': 'Umbilical cord separation takes \nSelect and explain. \nA. First 1 week, B. First 2 weeks, C. First 3 weeks, D. First 4 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Umbilical cord separation usually takes place within first 2 weeks.', 'role': 'assistant'}]