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
The first stimulus in IUL for Leydig cells to produce testosterone : 
Select and explain. 
A. LH, B. FSH, C. HcG, D. Progesterone
C: HcG
Answer: C: HcG 
Explanation: The first stimulus for leydig cells to produce testosterone is HcG The main stimulus for leydig cells to produce testosterone is LH.