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 patient presents withArthritis, hyperpigmentation of skin and hypogonadism, likely diagnosis is - \nSelect and explain. \nA. Hemochromatosis, B. Ectopic ACTH secreting tumour of the lung, C. Wilson's disease, D. Rheumatoid arthritis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]