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': 'Brown tumors, compression syndromes and erythropoietin resistance is seen in: \nSelect and explain. \nA. Hypothyroidism, B. Hyperthyroidism, C. Hyperparathyroidism, D. Osteoporosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Clinical manifestations of severe hyperparathyroidism include bone pain and fragility, brown tumors, compression syndromes\xa0and erythropoietin resistance in part related to the bone marrow fibrosis.', 'role': 'assistant'}]