QUESTION 3" which oFthe following should be considered carefullyr when designing a retrospective cohort study? I!" A Availability of exposure and ' outcome data in B Size of the cohort and cost of the ' study C Quality of the follow-up data D Scientic justication E A. EL and C lZAEI of the above QUESTION E- Researchers want to assess if there is an association between cigarette smoking and stroke. Of the fDlIUWll-lgr which is the best possible study design to assess for this association? WWW\") in A IZase series r E Crosssectional study I!" C ICohort study I'.' D Randomized controlled ' trial ,1 E Intervention study