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
True about HCG: September 2012 
Select and explain. 
A. 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
B: Prevent involution of corpus luteum
Answer: B: Prevent involution of corpus luteum 
Explanation: 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