Massive blood transfusion is defined as -: (A) 350 ml in 5 min, (B) 500 ml in 5 min, (C) 1 Litre in 5 min, (D) Whole blood volume
Answer is D. Massive Blood Transfusion is defined as-
According to Sabiston- .

transfusion greater than patient's total blood volume in 24 hrs
or as acute administration of more than 10 units of blood over a few hours.

According to Schwartz-
Massive transfusion is a single transfusion of 2500 ml or 5000 ml transfused over a period of 24hrs.