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': 'The relative risk of a disease measures the - \nSelect and explain. \nA. Strength of association between suspected cause and effect, B. Biological plausibility between suspected cause and effect, C. Temporal relationship between suspected cause and effect, D. Specificity of association between suspected cause and effect', 'role': 'user'}, {'content': "Answer: A \nExplanation: Defined as the ratio between the incidence among exposed persons and incidence among non exposed. A typical case-control study does not provide incidence rates from which relative risks can be calculated directly because there is no appropriate denominator or population at risk to calculate these risks. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 86", 'role': 'assistant'}]