This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
Massive transfusion of citrated blood leads to all except 
Select and explain. 
A. Metabolic acidosis, B. Hypothermia, C. Hyponatremia, D. Hypocalcemia
C: Hyponatremia
Answer: C: Hyponatremia 
Explanation: Massive blood transfusion results in

Metabolic acidosis( lactate from RBCs, citric acid as anticoagulant)
Hyperkalemia( stored blood K+ reaches 30mmol/L after 3 weeks)
Hypothermia (as stored blood is kept at 4°C)
Decreased ionized calcium( due to citrate binding to calcium).