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: Unknown
Aminoacyl – t- RNA is required for all except ? 
Select and explain. 
A. Hydroxyproline, B. Methionine, C. Cystine, D. Lysine
A: Hydroxyproline
Answer: A: Hydroxyproline 
Explanation: - Hydroxyproline is a derived amino acid and there is no t-RNA available to transport derived amino acids: hydroxyproline and hydroxylysine are two examples of derived amino acid for which there is no t-RNA available.