This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood transfusion, Subject name: Pathology
Most common blood transfusion reaction is: 
Select and explain. 
A. Febrile non-hemolytic transfusion reaction, B. Hemolysis, C. Transmission of infections, D. Electrolyte imbalance
A: Febrile non-hemolytic transfusion reaction
Answer: A: Febrile non-hemolytic transfusion reaction 
Explanation: The most frequent reaction associated with the transfusion of cellular blood components is a febrile non-hemolytic transfusion reaction (FNHTR). - In form of fever and chills, sometimes with mild dyspnea, within 6 hours of a transfusion of red cells or platelets. - Caused by inflammatory mediators derived from donor leukocytes. - The frequency of these reactions increases with the storage age of the product and is decreased by measures that limit donor leukocyte contamination. - Symptoms respond to anti-pyretics and are sho-lived.