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: Pathology
[{'content': 'A lady in the second trimester underwent a hemogram and her hemoglobin was found to be 6mg%. The gynaecologist suggested for IV transfusion of packed red cells to improve the level.\n\nHow much of iron is absorbed by transfusion of 2 units of packed red cells? \nSelect and explain. \nA. 2gm, B. 2mg, C. 1gm, D. 500mg', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]