Which one of the following compounds is not a vitamin?

In males,the retarded growth of secondary sexual characters is due to the deficiency of which of the following hormones?

Write two major functions each of testis and ovary.

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

$A$ boy after attaining sexual maturity shows muscular growth,growth of facial and axillary hair,aggressive behavior,and a low pitch of voice. These changes are attributed to the . . . . . . hormone.

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 $C$.