This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Menstrual Cycle, Subject name: Gynaecology & Obstetrics
[{'content': 'Mittelschimerz pain is - \nSelect and explain. \nA. Pain during onset of menstrual cycle, B. Pain during the usual time of ovulation in menstrual cycle, C. Pain during the or at the end of menstrual cycle, D. Pain during menstrual bleeding', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Pain during the usual time of ovulation in menstrual cycle o Has been explained in previous sessions.", 'role': 'assistant'}]