This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2019, Subject name: Social & Preventive Medicine
[{'content': 'What happens to minimum sample size when range of allowable error is doubled? \nSelect and explain. \nA. Reduced to 1/2, B. Reduced to 1/4, C. Reduced to 1/16, D. Sample size does not depend on acceptable error', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sample size = 4 Pq / L2 ( permissible error )Sample size a 1/ (error)2= 1/ (2E)2= 1/4', 'role': 'assistant'}]