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: Dental
[{'content': 'In a case-control study, the cases were found to be consuming zarda pan more frequently than controls and the difference was statistically significant. It indicates: \nSelect and explain. \nA. Zarda pan is the cause of the disease, B. The incidence of the disease was more in those consuming zarda pan, C. The disease can be cured if zarda pan is stopped, D. An association exists between zarda pan and disease', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Case-control study that looks backward in time from final disease outcome to potential cause.\xa0\nIn it, groups of affected individuals (cases) and unaffected individuals (controls) are compared to the extent of their exposure to some suspected risk factor.\xa0\n\nKey points\xa0\nIn a case-control study,\xa0 if the outcome was statistically signiﬁcant, there is an\xa0association between cases and controls.\nSoben Peter\xa0\nEssentials of preventive and community dentistry\xa0\n4th edition', 'role': 'assistant'}]