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': 'Who gave the model for demineralization & remineralization of white spot lesion? \nSelect and explain. \nA. Miller, B. Moreno, C. Martin, D. Massler', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The physiochemical process of white spot lesions was difficult to understand until the Moreno model was described. In this model, acids formed by cariogenic bacteria dissolve the surface as well as subsurface enamel. The calcium and phosphate ions from the subsurface dissolution diffuse downwards toward the surface and reprecipitate on the surface making the enamel surface appear unaltered.', 'role': 'assistant'}]