This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition & Digestion, Subject name: Biochemistry
[{'content': 'All are involved in iron metabolism except: \nSelect and explain. \nA. Hepcidin, B. Ferroportin, C. Transthyretin, D. Ceruloplasmin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. TransthyretinHepcidin is the regulator of iron homeostasis. Ferroprotin is their on exporter protein into circulation from intestinal cells. Ceruloplasmin has ferroxidase which convert Fe2+ to Fe3+ so it can serve the purpose of hephaestin in iron metabolism. Transthyretin is a transport protein for Thyroxine and Retinol.', 'role': 'assistant'}]