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
Over 60% of the world's Multi Drug Resistant TB cases are seen in which of the following countries? 
Select and explain. 
A. India, Brazil, Afghanisthan, B. India, China, Russian Federation, C. Africa, China, Brazil, D. India, Africa, Afghanistan
B: India, China, Russian Federation
Answer: B: India, China, Russian Federation 
Explanation: 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