Answer:IMMUNOAFFINITY CHROMATOGRAPHY
Explanation: IMMUNOAFFINITY CHROMATOGRAPHY is a purification technique used in the field of medicine which uses an antibody or a fragment of an antibody as a ligand attached onto a solid support matrix in a manner that retains its binding ability of the ligand. It is a specialized form of affinity chromatography which is used to purify antibodies or antigens from a heterogeneous solution or mixture,it is a column based chromatographic separation.