This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'The weight of placenta and fetus are equal at \nSelect and explain. \nA. 14 weeks, B. 16 weeks, C. 17 weeks, D. 21 weeks', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In the first trimester, placental growth is more rapid than that of the fetus. But by approximately 17 weeks, placental and fetal weights are approximately equal. Ref:Williams Obs 24e pg 95.', 'role': 'assistant'}]