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': 'Peak value of Karyopyknotic index is reached on \nSelect and explain. \nA. Proliferative phase, B. Day of ovulation, C. Secretory phase, D. Menopause', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Normally, peak value of KPI is reached on the day of ovulation.', 'role': 'assistant'}]