Infertility is a common feature in 'Sertoli cell only' syndrome, because

Infertility is a common feature in 'Sertoli cell only' syndrome, because 

1. Too many Sertoli cells inhibit spermatogenesis via inhibin.

2. Proper blood -testis barrier is not established.

3. There is no germ cells in this condition.

4. Sufficient numbers of spermatozoa are not produced.

Ans 3