This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Translation, Subject name: Biochemistry
[{'content': 'Which of the following is an example of post-translational modification? \nSelect and explain. \nA. Glutamate to Glutamine, B. Proline to Hydroxyproline, C. Aspaate to Asparagine, D. Leucine to Isoleucine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Proline has its own codons, hydroxy proline does not have. hydroxyproline is formed from proline by post-translational modification. Glutamate to glutamine is mutation, not post-translational modification. The same is true for option c and d.', 'role': 'assistant'}]