A nurse is caring for a patient with Paget's disease and is reviewing the patient's most recent laboratory values. Which of the following values is most characteristic of Paget's disease?
A). An elevated level of parathyroid hormone and low calcitonin levels
B). A low serum alkaline phosphatase level and a low serum calcium level
C). An elevated serum alkaline phosphatase level and a normal serum calcium level
D). An elevated calcitonin level and low levels of parathyroid hormone