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
Implosion therapy is implemented when according to Frankel's rating, the child is: 
Select and explain. 
A. Positive., B. Definitely positive., C. Negative., D. Definitely Negative.
D: Definitely Negative.
Answer: D: Definitely Negative. 
Explanation: None