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A 65 year old woman experienced shaking, chills and a fever of 103F approximately 40 minutes following the transfusion of a second unit of RBCs. The most likely explanation for the patients symptoms is:
a. Severe febrile transfusion reaction.
b. Anaphylactic transfusion reaction.
c. Congestive heart failure due to fluid overload transfusion of bacterially contaminated blood.