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: Medicine
[{'content': "Over 60% of the world's Multi Drug Resistant TB cases are seen in which of the following countries? \nSelect and explain. \nA. India, Brazil, Afghanisthan, B. India, China, Russian Federation, C. Africa, China, Brazil, D. India, Africa, Afghanistan", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Overall 60% of all MDR-TB cases are in India, China, and the Russian Federation. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 1341', 'role': 'assistant'}]