Immediately Following a Barium Swallow, a Client Noticed Hives and a Feeling

Immediately following a barium swallow, a client noticed hives and a feeling of shortness of breath. Although there were no known allergies to food or drugs prior to this incident, the diagnosis was allergic reaction to the preservatives in the barium. Which is the correct risk category for this incident?

A) Medication error
B) Medical-legal incident
C) Procedure complication
D) This incident does not fall into a risk category.