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': 'The stages of early childhood caries were given by: \nSelect and explain. \nA. Harris and Garcia-Godoy, B. Caufield and Griffen, C. Caufield and Tnnanoff, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The ECC is categorised in 4 stages by Harris and Garcia-Godoy based on the severity:\n\nVery mild\nMild\nModerate\nSevere', 'role': 'assistant'}]