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': 'In multibicillary leprosy, the follow up examination after adequate Rx should be done yearly for \nSelect and explain. \nA. 3 years, B. 5 yrs, C. 10 years, D. 2 years', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]