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: Gynaecology & Obstetrics
[{'content': 'Composition of Nova - T: \nSelect and explain. \nA. Copper and silver, B. Copper and aluminium, C. Copper only, D. Copper and selenium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nova-T is nothing but Cu-T, where silver is added to the copper wire thereby increasing lifespan of Cu-T from 3 years to 5 years in Nova-T.', 'role': 'assistant'}]