This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transfusion, Subject name: Medicine
Which is the complication of blood transfusion - 
Select and explain. 
A. Hyponatremia, B. Hyperkalemia, C. Hypercalcemia, D. Increased serum albumin
B: Hyperkalemia
Answer: B: Hyperkalemia 
Explanation: Ans. is 'b' i.e., Hyperkalemia Major complicated of Transfusion | ||CoagulopathyMetabolic | || GeneralElectrolyte o Fluid overloado Hypothermiao Impaired oxygen capicity of hemoglobin (i 43 DPG)o Hyperkalemiao Hypocalcemiao Hypomagnesemiao Alkalosis/Aciduria