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': 'A known sputum positive pulmonary tuberculosis patient currently on INH, rifampicin, pyrizinamide and ethambutol is found to be HIV positive. His CD4 count is 100 /dl and viral load is more than 50,000 copies/ml. Which of the following antiretroviral drug should be avoided in this patient? \nSelect and explain. \nA. Indinavir, B. Lamivudin, C. Ritonavir, D. Eirenz', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ritonavir a protease inhibitor should be avoided from the treatment of HIV, in a patient receiving rifampicin as a pa of antituberculosis treatment regime. Rifampin is a potent hepatic enzyme inducer. When this is co administered with a protease inhibitor, it decrease the availability of the drug upto 80%. This resulting low concentration of the drug promotes the development of drug resistance and treatment failure. Ref: Antiretroviral Therapy By Erik De Clercq, Page 347', 'role': 'assistant'}]