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
[{'content': 'Odds ration is designated as ? \nSelect and explain. \nA. ab/cd, B. ac/bd, C. bd/ac, D. ad/bc', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., ad/bc Odds - ratio (cross product ratio) From a case control study odds ratio can be derived which a measure of the strength of association between risk factor and outcome. Odds ratio is closely related to relative risk (which is analysed in coho study) - odds ratio represents only an estimate of relative risk.", 'role': 'assistant'}]