This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pharmacology
[{'content': 'Which of the following Iron is used for Parenteral Iron Therapy ? \nSelect and explain. \nA. Iron dextran, B. Ferrous sulphate, C. Ferrous fumarate, D. Ferrous gluconate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Parenteral irons Oral irons Iron dextran Iron - sorbitol - citric acid Ferrous sucrose Ferric carboxy maltose Iron isomaltoside Ferrous sulphate Ferrous gluconate Ferrous fumarate Colloidal Ferric hydroxide Carbonyl Iron Iron requirement (mg) = 4.4 x body weight (kg) x Hb deficit (g/dl)', 'role': 'assistant'}]