Brefly explain Endogenous antigen & examples & autoantigen

Exogenous antigens refer to the antigens that enter the body of the organism from the outside while endogenous antigens refer to the antigens produced from within the cell as a part of normal cell metabolism or when the cell is infected by bacteria or viruses.

Examples

viral proteins produced during viral replication;

proteins produced by intracellular bacteria such as Rickettsias and Chlamydias during their replication;

proteins that have escaped into the cytosol from the phagosome of phagocytes such as antigen-presenting cells;

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.