Type of study in risk factor associated with multiple diseases -

Ans. is 'a' i.e., Cohort study o In case control study we proceed from effect to cause by taking history. It is possible to take history of exposure of multiple risk factors - multiple risk factors can be identified for a single diseaseo In cohort study we start by exposing the study cohort to a particular risk factor and then follow up the cohort for the occurence of disease. So, several possible outcomes related to exposure can be studied simultaneously - we can study the association of the suspected factor with many other disease in addition to the one under study.y Case control studyy Cohort study--can identify multiple risk factors,can identify multiple outcome (disease).