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: Pediatrics
Exchange blood transfusion what is used ? 
Select and explain. 
A. Whole blood, B. EPP, C. Serum, D. Pack cell
A: Whole blood
Answer: A: Whole blood 
Explanation: Ans. is 'a' i.e., Whole blood