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': 'Ovulallon occurs : \nSelect and explain. \nA. 14 days after menstruation, B. 14 days before menstruation, C. 7 days after menses, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 14 days before menstruation', 'role': 'assistant'}]