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: Dental
[{'content': 'Which disclosing solution differentiates between mature and newly formed plaque: \nSelect and explain. \nA. Iodine, B. Erythrosine, C. Two tone dye solution, D. Mercurochrome', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]