Concept: Leydig cells are interstitial cells of the testis responsible for testosterone secretion.Explanation:
Leydig cells (interstitial cells) are located in the interstitial space — the connective tissue region outside the seminiferous tubules in the testis.
They are NOT found inside the seminiferous tubule wall, epididymis, or rete testis.
Their location outside the tubules allows them to secrete androgens (testosterone) into the bloodstream.
Answer: Option C — Leydig cells are present in the region outside the seminiferous tubules (interstitial tissue of the testis).