This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': 'Brown tumour is seen in- \nSelect and explain. \nA. Increased ptfcathyroid hormone, B. Increased thyroxine, C. Increase thyroid, D. Increased calcitonin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Brown tumour is seen in hyperparathyroidism. Brown tumours are not actually tumours but are localised accumulations of hemorrhage and blood pigments and reactive masses of osteoclasts in a spindle shaped stroma. Ref:harrison', 'role': 'assistant'}]