This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Iron deficiency anemia, Subject name: Pathology
[{'content': 'Hepcidin is secreted by which of the following? \nSelect and explain. \nA. Kidney, B. Bone marrow, C. Duodenum, D. Liver', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hepcidin A small circulating peptide that is synthesized and released from the liver in response to increases in intrahepatic iron levels Plays a central role in iron metabolism Regulates iron absorption in duodenum', 'role': 'assistant'}]