This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'The male sex hormone testosterone is produced by: \nSelect and explain. \nA. Sertoli cells, B. Epithelial cells, C. Interstitial cells of leydig, D. Primitive germ cells', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]