This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
In case control study of buccal carcinoma ? 
Select and explain. 
A. CA is commoner in zarda pan users than non users, B. Zarda pan is a cause of buccal CA, C. Zarda pan is associated with buccal CA, D. If use of zarda pan is stopped, number of cases will reduce
C: Zarda pan is associated with buccal CA
Answer: C: Zarda pan is associated with buccal CA 
Explanation: Ans. is 'c' i.e., Zarda pan is associased with buccal CA