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': "Implosion therapy is implemented when according to Frankel's rating, the child is: \nSelect and explain. \nA. Positive., B. Definitely positive., C. Negative., D. Definitely Negative.", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]