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
[{'content': 'In a post-operative patient, 21 years old with 70 kg weight, 1 unit of packed RBC will raise the hematocrit by: \nSelect and explain. \nA. 1, B. 5-Mar, C. 10-Jul, D. 15', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A rise in the hemoglobin of 1 g/dL ( hematocrit rise of 3%) occurs after transfusion of one unit of whole blood or PRBC in an adult.', 'role': 'assistant'}]