Deficiency of which vitamin leads to the degeneration of the testes?

The target of $ICSH$ is

Which of the following hormones influences libido?

Androgens act on the $A$ and influence the male sexual behavior called $B$. These hormones produce $C$ effect on protein and carbohydrate metabolism. Choose the correct combination of $A, B$ and $C$.

At the time of puberty in boys,which hormone triggers changes?

Select the option which correctly matches the endocrine gland with its hormone and its function.