This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Gynae), Subject name: Gynaecology & Obstetrics
[{'content': 'Failure rate of Copper IUCD is - \nSelect and explain. \nA. 3-4%, B. 0.01-0.03%, C. 0.5-1.5%, D. 4-5%', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'C' i.e., 0.5-1.5% Pearl Index of IUD * IUDs can be divided into three groups according to the pregnancy rate, indicating their contraceptive efficacy: 1) Group I (pregnancy rates greater than 2.0 per 100 women-year): Lippes loop, Cu 7 T 200 2) Group II (pregnancy rates less than 2.0 but more than 1 per 100 women-year): Nova T, ML Cu 250, and Cu T 220C 3) Group III (pregnancy rates less than 1 (mostly less than 0.5) per 100 women-year): Cu T 380A, Cu T 380S, ML Cu 375, and LNG 20", 'role': 'assistant'}]