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
Tyrosine is involved in the synthesis of? 
Select and explain. 
A. Melanin, B. Thyroxine, C. Epinephrine and norepinephrine, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None