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': 'Until the end of the 16th week, the placenta grows. At term, ratio of weight of fetus to weight of placenta is: \nSelect and explain. \nA. 3:01, B. 4:01, C. 6:01, D. 8:01', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Placenta at term is a circular disc with diameter 15-20 cm and thickness of 2.5 cm. Its weight is 500 gm. The propoion of weight of the fetus to the weight of the placenta is roughly 6:1 at term and occupies about 30% of the uterine wall. At term, about four-fifths of the placenta is of fetal origin. Ref: Textbook of Obstetrics by D C Dutta, 6th edition, Page 29.', 'role': 'assistant'}]