Which of the following is a true statement concerning hypoparathyroidism? A. Underactive parathyroid glands are much more common than overactive ones. B. The major blood abnormality in...

Which of the following is a true statement concerning hypoparathyroidism?

A. Underactive parathyroid glands are much more common than overactive ones.

B. The major blood abnormality in hypoparathyroidism is low blood calcium despite elevated PTH levels.

C. Hypoparathyroidism is usually caused by idiopathic parathyroid atrophy or a genetic defect.

D. Hypoparathyroidism may cause seizures.