This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Human Immunodeficiency Virus, Subject name: Microbiology
HIV primarily infects? 
Select and explain. 
A. CD4* cells, B. CD8+ cells, C. NK cells, D. All of these
A: CD4* cells
Answer: A: CD4* cells 
Explanation: ANSWER: (A) CD4+ cellsREF: Jawetz, Melnick, & Adelberg's Medical Microbiology, 24TH edition Chapter 44Repeat Microbiology December 2010