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 ovarian cycle increaed levels of LH are due to \nSelect and explain. \nA. Increased Progesterone, B. Increased FSH, C. Increased Androgens, D. Increased Estrogen', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Luteinising Hormone \n\nLH is a water-soluble glycoprotein of high molecular weight secreted by beta cells of the anterior pituitary gland\nLH surge initiated by estrogen lasts for 48 h. LH level doubles up in 2 hrs and peak plateaus for 14 hours before declining.\nMinimum of 75 ng/ml is required for ovulation', 'role': 'assistant'}]