<prompt> Relative risk is calculated in?Cross sectional studyCohort studyCase control studyNone  <response>: Ans. is b i.e., Cohort study CharacteristicsCohort StudyCase control StudyCross Sectional StudyDesignProspectiveRetrospectiveOne point in timeIncidenceEstimatedNot estimatedNot estimatedPrevalenceNot estimatedNot estimatedEstimatedCalculationso Incidence rateso Relative risko Attributable risko Odds ratio 