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
Largest size is: 
Select and explain. 
A. Spermatogonium, B. Primary Spermatocyte, C. Secondary spermatocyte, D. Spermatozoa
B: Primary Spermatocyte
Answer: B: Primary Spermatocyte 
Explanation: 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.