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': 'The property of proteins to absorb ultraviolet rays of light is due to \nSelect and explain. \nA. Peptide bond, B. Imino group, C. Di Sulphide bond, D. Aromatic amino acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Aromatic side chains (aromatic amino acids) are responsible for the UV light absorption of most proteins.', 'role': 'assistant'}]