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
Amino acids not coded by triplet codon: 
Select and explain. 
A. Lysine, B. Hydroxyproline, C. Selenocysteine, D. Pyrrolysine
B: Hydroxyproline
Answer: B: Hydroxyproline 
Explanation: B i.e. Hydroxyproline