This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
HIV affects - 
Select and explain. 
A. Only T helper cells, B. T helper and macrophages, C. NK cells, D. B-lymphocytes
B: T helper and macrophages
Answer: B: T helper and macrophages 
Explanation: Receptor for the virus is CD4 antigen and affect the cells with this receptor like CD4 T cell, macrophages, monocytes. REF:Textbook of microbiology, Ananthanarayan and Paniker. Page no.: 574