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 ratio is related to: \nSelect and explain. \nA. Incidence, B. Relative risk, C. Attributable risk, D. Prevalence', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Relative risk', 'role': 'assistant'}]