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: Physiology
[{'content': 'What is true of iron: \nSelect and explain. \nA. It is stored in ferritin, B. It is absorbed by Transferrin in the intestine, C. Spleen in major storage organ, D. Fe++ is excreted in urine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. It is stored in ferritin', 'role': 'assistant'}]