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
[{'content': 'Which is the most abundant amino acid in the structure of collagen \nSelect and explain. \nA. Proline, B. Glycine, C. Hydroxy proline, D. Phenylalanine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Glycine is the most abundant amino acid in collagen, as every 3rd amino acid in the structure is glycine.\nNote: Phenylalanine is not seen in collagen.', 'role': 'assistant'}]