Allergic reactions to radiological contrast agents are:
Anaphylactic reactions
IgE mediated reactions
Uicaria
Edema
In radiological imaging it is usually believed that the adverse effects of contrast media are non-IgE mediated anaphylactoid reactions, as a result of released vasoactive amines (histamine, serotonin, etc) which trigger the mast cells directly. Since anaphylactoid reaction is not given in the choice, anaphylactic reaction may be the right choice. Ref: Encyclopedia of Diagnostic Imaging By Albe L Bae Pages 44-46