This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Bank & Transfusion Therapy, Subject name: Medicine
Transfusing blood after prolonged storage could lead to: 
Select and explain. 
A. Citrate intoxication, B. Potassium toxicity, C. Circulatory overload, D. Haemorrhagic diathesis
B: Potassium toxicity
Answer: B: Potassium toxicity 
Explanation: Prolonged storage of blood can lead to hyperkalemia due to lysis of RBC. Citrate intoxication, circulatory overload & haemorrhagic diathesis results from massive blood trasfusion. Citrate intoxication - Hypocalcemia, manifested by circumoral numbness and/or tingling sensation of the fingers and toes. Circulatory overload - Transfusion-associated circulatory overload (TACO). Dyspnea, bilateral infiltrates on CXR with systolic hypeension and elevated levels of Brain natriuretic peptide (BNP). Haemorrhagic diathesis - Dilutional thrombocytopenia