Which level of evidence is most often placed at the top of the hierarchy of evidence for practice decisions? A. meta-analysis of multiple randomized clinical trials B. results from a single...

Which level of evidence is most often placed at the top of the hierarchy of evidence for practice decisions?

A. meta-analysis of multiple randomized clinical trials

B. results from a single well-controlled experimental study

C. a consensus of opinion from a group of experts on the topic

D. case-control studies