Given below is a diagrammatic sketch of a portion of human male reproductive system. Select the correct set of names of the parts labelled $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$

Sertoli cells are regulated by the pituitary hormone known as

Or

The hormone which acts on sertoli cells and stimulates the process of spermiogenesis is

Supporting cells found in between the germinal epithelium of testes are called
Or

Which of the following cells are present in mammalian testes and help to nourish sperms