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: Pharmacology
[{'content': 'What is the formula for parenteral iron therapy : \nSelect and explain. \nA. 4.4. X body weight (kg) X Hb deficit (g/dl), B. 3.3. X body weight (kg) X Hb deficit (g/ dl), C. 2.2 X body weight (kg) X Hb deficit (g/dl), D. 1.1 X body weight (kg) X Hb deficit (g/dl)', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]