This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tuberculosis, Subject name: Social & Preventive Medicine
XDR means extensive drug resistance to 
Select and explain. 
A. H+R, B. 1 Fluoroquinolone, C. Minimum of 1 injectable drug, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. (d) All of the aboveRef.: K. Park 23rd ed. /199-200Definition of Extensive Drug Resistance* Resistance to both isoniazid (H) and rifampicin, and* Resistance to 1 fluoroquinolones and* Resistance to one 2nd line injectables out of 3 (kanamycin, amikacin, capreomycin).Older Definition of XDR* Resistance of isoniazid (H) and rifampicin both +* Resistance to any 3rd line drugs.Also Know*Multiple drug resistance (MDR) means resistance to resistance to isoniazid (H) and rifampicin (R).