nbme 7 qu plz help - betagama

[ArchivalUser]

67 yr old man diagnosed with rectal cancer.which of the following study is most helpful to develop treatment strategy?
A-case control observational study
B-case report
C -cohort study
D-patient satisfaction survry
d-randomised control clinical trial

[ArchivalUser]

plz tell me the answers..i have exam in a week

[ArchivalUser]

E randomization