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: Pathology
[{'content': 'Rapid progression of disease with full blown manifestation in AIDS occurs when T4 cell count falls bellow- \nSelect and explain. \nA. 1000/microL, B. 500/microL, C. 200/microL, D. 50/microL', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Rapid progression of disease with full-blown manifestation in AIDS occurs when CD4 T cell count falls below 200/µL.', 'role': 'assistant'}]