This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetus Placenta & Fetal Membrane, Subject name: Gynaecology & Obstetrics
[{'content': 'Weight of placenta and fetus are equal at: \nSelect and explain. \nA. 14 weeks, B. 15 weeks, C. 17 weeks, D. 21 weeks', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is c, i.e. 17 weeksRef Williams Obs 24/e p 95"In the first trimester, placental growth is more rapid than that of the fetus. But by approximately 17 post menstrual weeks, placental and fetal weights are approximately equal" Ref Williams 24/e, p 95', 'role': 'assistant'}]