This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and Reproduction, Subject name: Physiology
[{'content': 'Inhibin is secreted by- \nSelect and explain. \nA. Ovarian Follicle, B. Stroma, C. Surface epithelium of ovary, D. Corpus luteum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans (a) Ovarian Follicle(Ref: Ganong, 25th ed/p.409)Inhibin is a heterodimer composed of an a subunit and a bA or bB subunit to form inhibin A or inhibin BInhibin A is secreted by dominant follicleInhibin B is produced mainly by granulosa cells', 'role': 'assistant'}]