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: Medicine
One unit of packed RBC increases the blood hemoglobin by 
Select and explain. 
A. 1 g/dl, B. 6-7 g/dl, C. 8-9 g/dl, D. None
A: 1 g/dl
Answer: A: 1 g/dl 
Explanation: None