This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': 'If a 95% confidence interval for prevalence of cancer smokers aged> 65 years is 56% to 76%, the chance that the prevalence could be less than 56% is- \nSelect and explain. \nA. Nil, B. 44%, C. 2.50%, D. 5%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref:Parks 23rd edition pg 849. 1SD : confidence limit = 68% 2SD : confidence limit = 95% 3SD : confidence limit = 99.7% Given, 95% values lie between 56 and 76% So, 5% values lie below 56 and above 76 altogether . So, 2.5% lies below 56.', 'role': 'assistant'}]