This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Which of the following is not a derivative of amino acid tyrosine 
Select and explain. 
A. Thyroxine, B. Melatonin, C. Melanin, D. Epinephrine
B: Melatonin
Answer: B: Melatonin 
Explanation: Melatonin and serotonin are derivatives of Tryptophan.