A 45-year-old man comes to his primary care physician complaining of back pain. On questioning, the patient indicates a recent history of polyuria, polydipsia, hypertension, and weight gain. X-ray of the spine shows an L4-L5 compression fracture. Which of the following is most likely to be elevated in this patient? (A) Cortisol (B) Glucagon (C) Growth hormone (D) Insulin (E) Thyroid hormones