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 of the following do not form violet colour in Biuret test? \nSelect and explain. \nA. Dipeptides, B. Alanine, C. Lactose, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Biuret test is for proteins. This test requires minimum of two peptide bonds.', 'role': 'assistant'}]