This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and family planning, Subject name: Social & Preventive Medicine
[{'content': 'Life span of Cu-T- 380A \nSelect and explain. \nA. 10 years, B. 20 years, C. 1 years, D. 5 years', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cu-T- 380A is approved for 10 years but it has been demonstrated to maintain its efficacy for at least 12 years of use Reference : Park&;s textbook of preventive and social medicine, 23rd edition, Page no: 497', 'role': 'assistant'}]