This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
All the following hormones are secreted by placenta except: 
Select and explain. 
A. hCG, B. TRH, C. ACTH, D. Insulin
D: Insulin
Answer: D: Insulin 
Explanation: Protein hormones produced by human placentaHuman chorionic gonadotropinPlacental lactogenACTHGnRHThyrotropin Growth hormone releasing hormoneGrowth hormone variantNeuropeptide YParathyroid hormone releasing proteinInhibinActivinRelaxin(Ref: William's Obstetrics; 25th edition)