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
Role of growth hormone in spermatogenesis 
Select and explain. 
A. Late division of spermatocytes, B. Early division of spermatogonia, C. Formation of acrosome, D. Stimulation of Seoli and Leydig cells
B: Early division of spermatogonia
Answer: B: Early division of spermatogonia 
Explanation: Growth hormone (as well as most of the other body hormones) is necessary for controlling background metabolic functions of the testes. Growth hormone specifically promotes early division of the spermatogonia themselves; in its absence, as in pituitary dwarfs, spermatogenesis is severely deficient or absent, thus causing infeility.