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': 'Sakaguchi’s reaction is specific for \nSelect and explain. \nA. Tyrosine, B. Proline, C. Arginine, D. Cysteine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Sakaguchi’s Test for Arginine : Free arginine or arginyl residues in proteins react with alpha-naphthol and alkaline hypobromite to give bright-red color. This is due to the guanidium group.\nReference: Vasudevan 7th\xa0 ed, pg 32', 'role': 'assistant'}]