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': 'Limits of confidence of a hypothesis determined by- \nSelect and explain. \nA. Power factor, B. Level of significance, C. 1-power factor, D. 1-level of significance', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .', 'role': 'assistant'}]