23. A lower-than-normal concentration of plasma calcium causes
(A) a decrease in bone resorption
(B) a decrease in the urinary excretion of calcium
(C) a decrease in the secretion of parathyroid hormone (PTH)
(D) a decrease in vitamin D release from the skin

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統計： A(0), B(0), C(0), D(1), E(0) #2773249