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': 'Cu T 380A IUCD should be replaced once in: \nSelect and explain. \nA. 4 years, B. 6 years, C. 8 years, D. 10 years', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 10 years', 'role': 'assistant'}]