<prompt> If you desire to study the incidence of diarrhea in a community which study method would you like to opt forCross-sectional studyCoho studyCase control studyDouble blind placebo study  <response>: The aim of study would be to find risk factors. It is a prospective study.In the coho study, we can determine incidence rates.;A well-designed coho study is considered the most reliable means of showing an association between a suspected risk factor and subsequent diseasePark 23rd edition pg: 76 