This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sex Hormones, Subject name: Physiology
Development of spermatozoa (sperm) from spermatogonium takes how much time- 
Select and explain. 
A. 3 0-3 5 days, B. 40-45 days, C. 50-55 day, D. 70-75 days
D: 70-75 days
Answer: D: 70-75 days 
Explanation: Ans. is 'd' i.e., 70-75 days o Spermatogenesis refers to the process of formation of spermatozoa (sperm) from primitive germ cells (spermatogonia).o Spermatogenesis begins at puberty' and continues throughout adult life to decline in old age.o In humans, it takes an average of 74 days to form a mature sperm from primitive germ cells.o Spermatogenesis occurs in seminiferous tubules.