This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraception, Subject name: Gynaecology & Obstetrics
[{'content': 'The effectivity of NORPLANT remains for : \nSelect and explain. \nA. 3 years, B. 5 years, C. 7 years, D. 10 years', 'role': 'user'}, {'content': "Answer: B \nExplanation: Jadelle or Norplant 2 is a levonorgestrol contraining subdermal implant in 2 sialistic rods and is approved to use for 5 years Reference: William's Textbook of Obstetrics 24th edition page no 723", 'role': 'assistant'}]