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
[{'content': 'Spermatogonium to spermatozoon transformation takes place in: \nSelect and explain. \nA. 64 days, B. 74 days, C. 84 days, D. 94 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.', 'role': 'assistant'}]