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: Medicine
[{'content': 'Mucosal tranfer of iron in GIT by- \nSelect and explain. \nA. Transferrin, B. Apoferritin, C. Apotransferrin, D. Ferritin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]