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
[{'content': 'Aminoacyl – t- RNA is required for all except ? \nSelect and explain. \nA. Hydroxyproline, B. Methionine, C. Cystine, D. Lysine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - 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.', 'role': 'assistant'}]