The interstitial endocrine cells that produce testosterone are located a) in the rete testis b) between the seminiferous tubules c) in the epididymis d) lining the ductus deferens

B) between the seminiferous tubules

Explanation:

The interstitial endocrine cells which produce testosterone are called Leydig cells (interstitial cells of Leydig). The function of these cells is to release androgen hormones like testosterone, dehydroepiandrosterone (DHEA) and androstenedione.

Different seminiferous tubules are surrounded by basal lamina and the clusters of the Leydig cells in interstitial compartment between each seminiferous tubules.