This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Embryology, Subject name: Anatomy
Spermatogonium to spermatozoon transformation takes place in: 
Select and explain. 
A. 64 days, B. 74 days, C. 84 days, D. 94 days
B: 74 days
Answer: B: 74 days 
Explanation: Ans. B 74 daysRef: I.B. Singh, 9th ed. pg. 14-15* Please refer to the image given about how spermatogonium undergoes mitotic division and forms primary spermatocyte, which further forms secondary spermatocyte and spermatid after first and 2nd meiotic division respectively.* Microscopically primary spermatocyte is largest in size among all.* The formation of spermatogonium to spermatozoa takes around 74 days.