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': 'True about spermatogenesis: \nSelect and explain. \nA. It takes 74 days, B. Takes place in spermatic cord, C. Meiosis occurs only after secondary spermatocyte, D. Spermatid is formed from spermatozoa', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) It takes 74 daysRef. Textbook of Human Embroyology / 24* Spermatogenesis - Process of formation of spermatozoa from primitive germ cell (spermatogonia)* Spermiogenesis - Formation of spermatozoa from spermatid.* Spermatogenesis begins at-puberty (oogenesis begins intrauterine life)* Spermatogenesis continue-throughout life (oogenesis- stops at menopause)* Average time-74 days* Site- seminiferous tubule* Sperm size- 55-65 pm* Parts- head, neck, middle piece, principal piece, end piece.* Acquire motility in- epididymis.', 'role': 'assistant'}]