This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Structure & Function of Proteins), Subject name: Biochemistry
Aromatic amino acid is - 
Select and explain. 
A. Serine, B. Histidine, C. Leucine, D. Tryptophan
D: Tryptophan
Answer: D: Tryptophan 
Explanation: Ans. is 'd' i.e., Tryptophan o Aromatic amino acids - Phenylalanine, tryptophan, tyrosine.