A biologist passes blood isolated from a mouse through an affinity column containing beads. The beads have been modified to display both the antigen alone and the antigen attached to a class II MHC molecule. Some cells stick to the column while the rest wash through with a buffer wash. Which class(es) of cells would be represented by the cells that stick to the column?

a. Macrophage only
b. T-helper cell only
c. Macrophage and B Cell
d. T-helper cell and B Cell