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: Anatomy
HcG is secreted by : 
Select and explain. 
A. Trophoblast cells, B. Amniotic membrane, C. Fetal yolk sac, D. Hypothalamus
A: Trophoblast cells
Answer: A: Trophoblast cells 
Explanation: Synctiotrophoblasts are the principal site of protein and steroid hormones in pregnancy HcG is synthesized by synctiotrophoblast . Ref :Dutta Obs 9 e pg 53.