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
At what POG placental and fetal weights are approximately equal 
Select and explain. 
A. 15 week, B. 17 week, C. 19 week, D. 21 week
B: 17 week
Answer: B: 17 week 
Explanation: By approximately 17 postmenstrual weeks,placental and fetal weights are approximately equal. By term, placental weight is approximately one sixth of fetal weight.