This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Allergic reactions to radiological contrast agents are - 
Select and explain. 
A. Anaphylactic reactions, B. IgE mediated reactions, C. Urticaria, D. Edema
A: Anaphylactic reactions
Answer: A: Anaphylactic reactions 
Explanation: Acute non-renal reaction to a radiocontrast agent may be -


Non-IgE mediated anaphylactic reactions
Vasomotor / vasovagal reactions.