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': "All are features of Jansen's disease, except: \nSelect and explain. \nA. The disorder leads to sho-limbed dwarfism, B. High parathormone levels, C. Hypophosphatemia, D. Hypercalcemia", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mutations in the PTH/PTHrP receptor is the cause of this rare autosomal dominant syndrome. The disorder leads to sho-limbed dwarfism due to abnormal regulation of chondrocyte maturation in the growth plates of the bone. In adult life, there are numerous abnormalities in bone, including multiple cystic resorptive areas resembling severe hyperparathyroidism. Hypercalcemia and hypophosphatemia with undetectable or low PTH levels are typically seen. Ref: Harrisons Principles of Internal Medicine, 18th Edition, Page 3105.', 'role': 'assistant'}]