This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Reproductive physiology and hormones in females, Subject name: Gynaecology & Obstetrics
[{'content': 'In ovarian cycle increased levels of LH are due to : \nSelect and explain. \nA. Increased Progesterone, B. Increased Estrogen, C. Increased FSH, D. Increased Androgens', 'role': 'user'}, {'content': "Answer: B \nExplanation: Luteinising Hormone LH is a water-soluble glycoprotein of high molecular weight secreted by beta cells of the anterior pituitary gland LH surge initiated by estrogen lasts for 48 h. LH level doubles up in 2 hrs and peak plateaus for 14 hours before declining. Minimum of 75 ng/ml is required for ovulation Ref: Shaw's Textbook of Gynaecology, 16th edition, page no: 39", 'role': 'assistant'}]