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': 'Whenever the caries cone in enamel is larger or at least the same size as that in dentin, it is called as \nSelect and explain. \nA. Residual caries, B. Recurrent caries, C. Forward caries, D. Backward caries', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]