Compound 'Z' Is Considered a Vitamin If

Compound 'Z' is considered a vitamin if:

A) It is vital for physiological processes in humans and is not synthesised in adequate amounts in the body.
B) Its basic chemical structure must be that of an amine.
C) It is an organic compound and its deficiency is associated with a disease or disorder.
D) The body needs it in amounts measured in less than a gram every day.
E) Undesirable toxic effects are unlikely when ingested in excessive amounts.