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
Following are the essential amino acids: 
Select and explain. 
A. Phenylalanine, Tryptophan, Lysine, B. Phenylalanine, Asparagine, Methionine, C. Phenylalanine, Valine, Glycine, D. Histidine, Glutamine, Valine
A: Phenylalanine, Tryptophan, Lysine
Answer: A: Phenylalanine, Tryptophan, Lysine 
Explanation: None