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: Pathology
Which of the following complications is likely to result after several units of blood have been transfered? 
Select and explain. 
A. Metabolic acidosis, B. Metabolic alkalosis, C. Respiratory alkalosis, D. Respiratory acidosis
B: Metabolic alkalosis
Answer: B: Metabolic alkalosis 
Explanation: Massive transfusion is defined as the need to transfere one to two times the patients normal blood volume or >50% of blood volume wihtin 3 hours.
In a normal adult, this is equivalent 10-20 units
Most common abnormality is metabolic alkalosis.
It results from the conversion of citrate (present in stored blood) and lactate (accumulated due to hypoperfusion) to bicarbonate.