This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sex Hormones, Subject name: Physiology
[{'content': 'Sertoli cells play a key role in which of the following process \nSelect and explain. \nA. Spermiogenesis, B. Testosterone secretion, C. Secretion of seminal fluid, D. Gonadogenesis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Spermiogenesis', 'role': 'assistant'}]