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': 'Colour dye detector is used for: \nSelect and explain. \nA. Detecting incipient carious lesions, B. Caries susceptibility, C. Differentiating between affected and effected dentin, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]