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
According to Hierarchy of Evidence for Scientific Literature, Randomized control trials are 
Select and explain. 
A. Level I Evidence, B. Level II Evidence, C. Level III Evidence, D. Level IV Evidence
B: Level II Evidence
Answer: B: Level II Evidence 
Explanation: None