Problem: A 76-year-old woman presents to the office with generalized weakness for the past month. She has a past medical history significant for uncontrolled hypertension and type 2 diabetes mellitus. Her vital signs include temperature 37.0°C (98.6°F), pulse rate 90/min, respiratory rate 17/min, blood pressure 135/82 mm Hg, and oxygen saturation of 99% on room air. Physical exam shows no remarkable findings. Her last recorded glomerular filtration rate was 30 mL/min. A radiograph of the patient's hand shows subperiosteal bone resorption. Which of the following laboratory findings is most likely to be seen in this patient? A. Increased parathyroid hormone (PTH), decreased calcium, and increased phosphate B. Decreased PTH, decreased calcium, and increased phosphate C. Increased PTH, increased calcium, and decreased phosphate D. Increased PTH, increased calcium, and increased phosphate E. Normal PTH, increased calcium, and normal phosphate