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
Outright or full-blown AIDS is characterized by: 
Select and explain. 
A. CD4 T-cell<800 cells/mm3, B. CD4 T-cell<600 cells/mm3, C. CD4 T-cell<400 cells/mm3, D. CD4 T-cell<200 cells/mm3
D: CD4 T-cell<200 cells/mm3
Answer: D: CD4 T-cell<200 cells/mm3 
Explanation: None