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': 'TODAY, failure rate is \nSelect and explain. \nA. 0-5/100 woman years, B. 5-10/100 women years, C. 0-1/100 woman years, D. 9-20/100 women years', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]