This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Massive blood transfusion is defined as 
Select and explain. 
A. 500 ml in 10 min, B. 250 ml in 5 min, C. 1 unit in 1 hour, D. 2500 ml or 5000 ml in 24 hours
D: 2500 ml or 5000 ml in 24 hours
Answer: D: 2500 ml or 5000 ml in 24 hours 
Explanation: According to Schwaz Massive transfusion is a single transfusion of 2500 or 5000 ml over a period of 24 hours .