This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Menstruation, Abnormal Menstruation, Menopausal Physiology and forsight of conception, Subject name: Gynaecology & Obstetrics
[{'content': "Ovulation is seen after how many hours of the 'Peak' of the 'Up stroke' in this diagram here : \nSelect and explain. \nA. 0-6 hours, B. 10-12 hours, C. 12-24 hours, D. 24-36 hours", 'role': 'user'}, {'content': 'Answer: B \nExplanation: From the onset of the LH surge, it takes 34-36 hours and from the peak it takes 10-12 hours to ovulate. The midcycle LH surge is responsible for a dramatic increase in local concentrations of prostaglandins and proteolytic enzymes in the follicle. These substances progressively weaken the follicular wall and ultimately allow a perforation to form.', 'role': 'assistant'}]