A 54-year-old woman takes dietary supplements that provide her with 1000 mg of elemental calcium per day. If she had already been on a normal diet, what effect will this supplement have on hormone levels in her plasma?"
A. A decrease in circulating PTH (parathyroid hormone) levels. B. A decrease in circulating CT (calcitonin) levels C. A decrease in vitamin D levels. D. A decrease in 25(OH)D levels. E. A decrease in 1,25(OH)2D levels. F. A decrease in thyroid hormone levels. G. No effect