All of the following are tyrosine derivatives, EXCEPT: (A) Serotonin, (B) Melanin, (C) Epinephrine, (D) Thyroxine
Answer is A. Melanin, Catecholamines (Dopamine, Norepinephrine, Epinephrine), Thyroxine are the derivatives are tyrosine. Serotonin is a tryptophan derivative.