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
Type 2 moderate ECC refers to: 
Select and explain. 
A. 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
B: Labio lingual extension of caries involving incisors and/or molars.
Answer: B: Labio lingual extension of caries involving incisors and/or molars. 
Explanation: Option c is mild.
Option b is moderate.
Option d is severe