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
Hopkins-Cole test is performed on proteins to detect the presence of 
Select and explain. 
A. Imidazole group, B. Indole group, C. Guanidine group, D. Phenolic group
B: Indole group
Answer: B: Indole group 
Explanation: None