Answer:
C
Step-by-step explanation:
The major histocompatibility complex (MHC) is a group of genes whose function is to codify proteins that participate in the immune response, helping the system to recognize foreign substances to develop an immune response.
Histocompatibility or compatibility of tissue is given by self-identifications molecules (antigens) located on the surface of cells, membrane, these molecules are almost unique to each person, letting the body to distinguish self from non-self.