What is the chief product of the Sertoli cell?

A 19-year-old man presented with late development of his pubic and axillary hair. He was otherwise well and was not taking any medication. His serum testosterone concentration had been normal on two previous occasions.

On examination, he now had post-pubertal secondary sexual characteristics. He had 15C20 mL testes.

Investigations:

serum testosterone27.0 nmol/L (9.0C35.0)

serum sex hormone binding globulin28 nmol/L (10C62)

serum follicle-stimulating hormone2.0 U/L (1.0C7.0)

serum luteinising hormone2.9 U/L (1.0C10.0)

What is the chief product of the Sertoli cell?
A . anti-Müllerian hormone
B . kisspeptin
C . oestrogen
D . serum sex hormone binding globulin
E . testosterone