In case control study of buccal carcinoma:
Ans. is 'c' i.e. Zarda pan is associated with buccal Ca. In a case control study, case and effect relationship is not established, we only get to know about associated factors.
CA is commoner in zarda pan users than non-users
Zarda pan is a cause of buccal CA
Zarda pan is associated with buccal CA
If use of zarda pan is stopped, number of cases will reduce
Analytical Epidemiology