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': 'One unit of fresh blood rises the Hb% concentration by: \nSelect and explain. \nA. 0.1 gm%, B. 1 gm%, C. 2gm%, D. 2.2 gm%', 'role': 'user'}, {'content': "Answer: B \nExplanation: In general for a stable, euvolemic adult patient, the transfusion of 1 unit of packed cells raises the hemoglobin concentration by 1g/dl. Ref: Fundamentals of Surgical Practice By Andrew Kingsnoh, Douglas Bowley, 3rd Edition, Page 234; Bailey and Love's Sho Practice of Surgery, 24th Edition, Page 62.", 'role': 'assistant'}]