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': 'Hopkins-Cole test is performed on proteins to detect the presence of \nSelect and explain. \nA. Imidazole group, B. Indole group, C. Guanidine group, D. Phenolic group', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]