Q: What cells in the testes are responsible for the secretion of testosterone?  

Answer: C

Testosterone is secreted by Leydig cells or interstitial cells of the testes. These cells are located close to the seminiferous tubules in the testes and are responsible for producing androgens such as testosterone, under the control of pituitary luteinizing hormone (LH). Leydig cells are the primary source of testosterone or androgens in males, which plays a crucial role in the development and maintenance of male sexual characteristics such as deepening of voice, growth of facial and body hair, and the development of the male reproductive system.

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