Dr. Miller is a pediatric nutritionist working with a patient who has a low dietary calcium intake. Concerned about the possibility of hypocalcemia, she orders bloodwork. What hormone would you expect to be elevated in this patient’s bloodwork?

• A. Aldosterone.
• B. Atrial Natriuretic Peptide.
• C. Antidiuretic Hormone.
• D. Parathyroid Hormone.