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': 'The ovarian tumour diagnosed after delivery should be removed : \nSelect and explain. \nA. Immediately after the 3rd stage, B. Within 48 hours of delivery, C. After one week, D. Only after 6 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Within 48 hours of delivery', 'role': 'assistant'}]