This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Placenta - Types and their complications, Subject name: Gynaecology & Obstetrics
[{'content': 'Placenta takes over function of corpus luteum for production of hormone at: \nSelect and explain. \nA. 8 weeks, B. 12 weeks, C. 18 weeks, D. 24 weeks', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Placenta stas making estrogen, progesterone after 6 weeks Luteo-placental shift occurs from 6-9 weeks, this means that the placenta stas to TAKE OVER the function of corpus luteum of hormone production such that by 8-9 weeks, most of estrogen and progesterone in maternal circulation is placental in origin. The function of the corpus luteum begins to decline after 8 wk of pregnancy, but it persists throughout pregnancy.', 'role': 'assistant'}]