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 these is a denaturating substance: \nSelect and explain. \nA. Guanosine, B. Guanidine, C. Glutamate, D. Glycine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Guanidine', 'role': 'assistant'}]