This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2019, Subject name: Pathology
What among the following is the use of this? 
Select and explain. 
A. Prevent viral infections, B. Prevent transfusion related reactions, C. Prevent bacterial contamination, D. Prevent blood mismatch
B: Prevent transfusion related reactions
Answer: B: Prevent transfusion related reactions 
Explanation: The picture given above shows the WBC filter. | WBC's entering the body of the recipient | are the chances of development of transfusion related reactions. Purpose of having this kind of filter is that: - lesser chances of entry of WBC inside the body of the host. - Prevent the entry of (Cell) aggregates inside the body of the recipient. The size of the WBC filters can range from 170- 200m. The size of the transfusion needle is 18-19 gauge.