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': 'A 48-year-old Caucasian man, diagnosed with diabetes 5 years ago, comes to the physician because of palpitations, Physical examination shows a diffuse darkening of his skin and testicular atrophy. Laboratory studies show elevated liver function and elevated blood sugars. A liver biopsy shows significantly elevated iron levels A diagnosis of hereditary hemochromatosis is made. \nWhich one of the following laboratory findings is seen in hereditary hemochromatosis? \nSelect and explain. \nA. Decreased serum ceruloplasmin, B. Decreased serum ferritin, C. Decreased serum iron, D. Decreased total iron-binding capacity', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]