This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
Spermatogenesis is maintained by which hormones (s) 
Select and explain. 
A. Testosterone, B. FSH, C. LH, D. Prolactin
A: Testosterone
Answer: A: Testosterone 
Explanation: Spermatogenesis defined as the entire process by which spermatogonial stem cells divide and differentiate into sperms. The process has three phases: spermatocytogenesis, meiosis, and spermiogenesis.Ref: Ganong&;s review of medical physiology; 24th edition; page no:-420