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': 'Type 2 moderate ECC refers to: \nSelect and explain. \nA. Isolated carious lesions involving any tooth., B. Labio lingual extension of caries involving incisors and/or molars., C. Isolated carious lesion involving incisors and/or molars., D. Tooth surfaces considered as immune to decay, also involves', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Option c is mild.\nOption b is moderate.\nOption d is severe', 'role': 'assistant'}]