Cytotoxic T cells recognize and kill host cells infected by viruses. They recognize these cells by the foreign antigen displayed on the host cell’s:. A. MHC I molecules
B. MHCII molecules
C. toll like receptors

The correct answer is - A. MHC I molecules

Explanation:

Major histocompatibility complexes (MHCs) are presented to different T cells to identify the antigen on the host or infected cell. There are two MHCs - class I and class II. The class I MHC presents to cytotoxic T cells while MHC II to helper T cells.

A cytotoxic T cell only binds to the infected cell displays the foreign antigen such as viruses on the infected cell surface in order to recognize and kill the cells.

cuz they cant breath

explanation:

layer 3 is younger than layer 6.