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': 'Relative risk is represented by ? \nSelect and explain. \nA. Incidence among exposed/incidence among non-exposed, B. Incidence among non-exposed/incidence among exposed, C. Incidence in exposed minus incidence in non-exposed, D. None of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Incidence among exposed/incidence among nonexposed", 'role': 'assistant'}]