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
Frankel	behaviour	rating	system	does	not	include
following behaviour: 
Select and explain. 
A. Definitely positive, B. Definitely negative, C. Positive, D. Indifferent
D: Indifferent
Answer: D: Indifferent 
Explanation: None