Q. A 30-year-old woman presents to her primary care physician with a three-month history of fatigue and muscle weakness. She reports that she has been feeling more tired than usual and has been experiencing muscle weakness and muscle cramps. The patient's vital signs on presentation are: blood pressure 120/80 mm Hg, pulse rate 80 beats/minute, and respiratory rate 16 breaths/minute. The physical examination is unremarkable. Further evaluation reveals elevated levels of calcium in the patient's blood and a low level of calcium excretion in her urine with normal levels of PTH and phosphate levels. The patient is advised to follow a low calcium diet. She is also referred to an endocrinologist for further management. What is the most likely diagnosis for this patient?