This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
[{'content': 'XDR-TB is resistant to - \nSelect and explain. \nA. AKT(HRZE), B. HRKN, C. HRKO, D. HREEt', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Extensively drug resistant TB is defined as resistance to atleast rifampicin, & isoniazid,in addition to any quinolone & atleast one injectable second line agent(kanamycin). Reference: Harrison20th edition pg 1079', 'role': 'assistant'}]