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
Which is not secreted by placenta ? 
Select and explain. 
A. HPL, B. HCG, C. Prolactin, D. Progesterone
C: Prolactin
Answer: C: Prolactin 
Explanation: Prolactin