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': 'Biurette test is mainly done for: \nSelect and explain. \nA. Carbohydrate., B. Protein., C. Lipids., D. Any of the above.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Satyanarayan – 65\nWhen biurette is treated with dilute copper sulfate in alkaline medium, a purple color is obtained. This is the basis of biurette test widely used for identification of proteins and peptides.', 'role': 'assistant'}]