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': 'In a young female ot reproductive age with regular menstrual cycles of 28 days, ovulation occurs around 14th day of periods. When is first polar body extruded ? \nSelect and explain. \nA. 24 hours prior to ovulation, B. Accompanied by ovulation, C. 48 hours atter the ovulation, D. At ths time of feilization', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Accompanied by ovulation', 'role': 'assistant'}]