This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure and function of protein, Subject name: Biochemistry
[{'content': "Which of the following is not a test for amino acids? \nSelect and explain. \nA. Biuret test, B. Xanthoproteic reaction, C. Ninhydrin test, D. Molisch's test", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Biuret test, ninhydrin test, and xanthoproteic test are tests of proteins. Molisch test is that for carbohydrates.Ref: Textbook of medical biochemistry, MN Chatterji, 8th edition, page no: 80', 'role': 'assistant'}]