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: Microbiology
Kaposi's sarcoma (KS) usually occurs when CD4+ lymphocyte counts are: 
Select and explain. 
A. Above 600, B. Between 1000-2000, C. Below 200, D. Above 2000
C: Below 200
Answer: C: Below 200 
Explanation: When CD4 count falls less than 200/L, the patient develops full-blown AIDS. This stage is characterized by the development of HIV wasting syndrome with weight loss and diarrhea for 1 month.
The patients with AIDS show a marked susceptibility to the development of malignancies. 
Human herpes virus-8–associated Kaposi’s sarcoma is the most noted malignancy associated with AIDS.

​Parija SC. Textbook of Microbiology & Immunology. Elsevier Health Sciences; 2014. Page:571