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: Pathology
[{'content': "During a routine checkup a 70 year old mate is found to have Serum Alkaline Phosphatase three times the upper limit of norrnal. Serum Calcium, Serum Phosphorous and liver function tests are normal. The most likely diagonsis is \nSelect and explain. \nA. Primary hyperparathyroidism, B. Paget's disease of the bone, C. Osteomalacia, D. Metastatic bone disease", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]