This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fertilization and Development of Embryo, Subject name: Anatomy
[{'content': 'Largest size is: \nSelect and explain. \nA. Spermatogonium, B. Primary Spermatocyte, C. Secondary spermatocyte, D. Spermatozoa', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Primary SpermatocyteRef: I.B. Singh 9th ed. H4-15* Please refer to the image given about how spermatogonium undergoes mitotic division and forms primary spermatocyte, which further forms secondary spermatocyte and spermatic 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'}]