Which of the Following Shows the Correct Levels of Evidence

Multiple Choice

Which of the following shows the correct levels of evidence from the least strong research to the strongest?

A) Systematic review of randomized controlled trials, individual randomized controlled trial, all-or-none, systematic review of cohort studies, individual cohort study, outcome research, systematic review of case-control studies, single-case control study, case series, expert opinion and bench research
B) Systematic review of randomized controlled trials, individual randomized controlled trial, systematic review of cohort studies, individual cohort study, all-or-none, outcome research, systematic review of case-control studies, single-case control study, case series, expert opinion and bench research
C) Expert opinion and bench research, case series, single-case control study, systematic review of case-control studies, outcomes research, individual cohort study, systematic review of cohort studies, all-or-none, individual randomized controlled trial, systematic review of randomized controlled trials
D) Systematic review of randomized controlled trials, individual randomized controlled trial, all-or-none, outcomes research, systematic review of cohort studies, individual cohort study, outcome research, systematic review of case-control studies, single-case control study, case series, expert opinion and bench research