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': 'True about iron is \nSelect and explain. \nA. Parenteral iron is indicated when anemia response slowly to oral iron, B. Ferrous sulphate 200mg has less elemental iron then the same dose of ferrous gluconate, C. Sustained release iron is a useful way of giving larger doses, D. Absorption of iron is increased by ascorbic acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: . Absorption of iron is increased by ascorbic acid', 'role': 'assistant'}]