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': 'True about HCG: September 2012 \nSelect and explain. \nA. Produced by cytotrophoblast, B. Prevent involution of corpus luteum, C. Value reaches maximum level at 20 week of pregnancy, D. Its secretion stas after 2 day of ovulation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Prevent involution of corpus luteum Beta-HCG HCG is secreted by: Synctiotrophoblasts Structurally HCG has: 2 subunits, It is a glycoprotein', 'role': 'assistant'}]