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': 'True about Tuberculosis HIV patients - \nSelect and explain. \nA. Sputum positivity, B. INH prophyaxis prevent development ofT.B, C. Lack characteristics feature of T.B, D. Highly positive PPD reaction', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Sputum is negative in half of the patients because of absence of pulmonary cavities There are 4 main differences in clinical presentation in TB in HIV patients 1.TB progresses more rapidly 2.chest x ray appearance alters 3.sputum smears may be negative 4.classic miliary pattern may be seen Ref Harrison 20th edition pg 887', 'role': 'assistant'}]