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: Surgery
One unit of PRBC raises HCT by: (In exam instead of HCT, they wrote HCV, which we assume to be a spelling error): 
Select and explain. 
A. 1%, B. 2%, C. 3-5%, D. 5-8%
C: 3-5%
Answer: C: 3-5% 
Explanation: None