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': 'Ovulation following delivery, in a non-lactating mother, may occur earliest at: September 2011 \nSelect and explain. \nA. 3 weeks, B. 4 weeks, C. 5 weeks, D. 10 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: 4 weeksIn non-lactating mothers, ovulation may occur as early as 4 weeks and in lactating mothers about 10 weeks after delivery', 'role': 'assistant'}]