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 body weight (kg) Hb deficit (g/dl), B. 3.3 body weight (kg) Hb deficit (g/dl), C. 2.2 body weight (kg) Hb deficit (g/dl), D. 1.1 body weight (kg) Hb deficit (g/dl)', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 4.4 body weight (kg) Hb deficit (g/dl) Total parenteral iron requirement can be calculated by :? 4.3 x Body weight (kg) x Hb deficit (g/dl)", 'role': 'assistant'}]