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': 'In ICDAS — II, score 2 indicates? \nSelect and explain. \nA. First enamel visual change, B. Distinct enamel change, C. Microcavitation, D. Underlying dentin shadow', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]