The government of Country A decided to introduce a new treatment strategy for disease X.It was decided that,starting in January 1,2019,all patients diagnosed with disease X in public hospitals would receive the new treatment.Researchers were asked to evaluate the new treatment.Which of the following designs is the best approach to evaluate the new treatment?

A) Randomized clinical trial
B) Case-control study
C) Cross-sectional survey
D) Before-after study
E) Case-series

Randomized Clinical Trial

A scientific study in which participants are randomly assigned to one of the treatment or control groups to assess the efficacy of a medical intervention.

Before-after Study

A study design in which the same group of subjects is measured before and after a specific intervention or event, to assess its effects.

Case-control Study

A type of observational study where two groups are compared: those with the disease or outcome of interest (cases) and those without the disease (controls), to identify factors that may contribute to the disease's presence.