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 of early childhood caries in which labio-lingual extension of caries occurs involving incisors and /or molars is: 
Select and explain. 
A. Type1 ECC, B. Type2 ECC., C. Type3 ECC., D. None.
B: Type2 ECC.
Answer: B: Type2 ECC. 
Explanation: None