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
The type of study used in the 10 year Fluoride tablets
study can be also be described as a (an) 
Select and explain. 
A. Case control study, B. Cross section study, C. Count study, D. Experimental study
D: Experimental study
Answer: D: Experimental study 
Explanation: None