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 cariogram, green color indicates \nSelect and explain. \nA. Actual chance of avoidance of new caries, B. Diet, C. Bacteria, D. Susceptibility', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]