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': 'The most potent risk factor for TB among infected individuals is which of the following conditions? \nSelect and explain. \nA. Silicosis, B. Diabetes, C. HIV infection, D. Chronic renal failure', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In absolute terms, the most potent risk factor for TB among infected individuals is HIV co-infection. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page1343, Table 165-1', 'role': 'assistant'}]