[A]
An antibody contains high molecular weight RNA as its basic structure
[B]
An antibody is composed of protein and cannot be distinguished from the albumin fraction of the serum proteins
[C]
An antibody is composed of four identical protein subunits which may be caused to dissociate by treatment with urea
[D]
An antibody contains protein as its major chemical component and its synthesis may be elicited by the administration of a foreign protein or polysaccharide