This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': "A study found Odd's ratio of maternal hypeension to have IUGR fetus to be 1:5. What is the interpretation drawn ? \nSelect and explain. \nA. Positive association, B. Common association, C. Inverse association, D. Rare outcome", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Framework of a case control study (The 2 x 2 contigency table) Suspected or risk factors Cases (Disease present) Control (Disease absent) Present Absent a c b d a+c b+d Odds Ratio used to calculate strength of association between risk factor and outcome in case of case control studies. Odds Ratio (OR) = (a x d)/(b x c) Interpretation: OR >1 --> Positive association OR =1 --> No association OR <1 --> Negative/inverse association In this question, OR is 1:5, i.e, 1/5 = 0.2 hence inverse association.', 'role': 'assistant'}]