Hypoparathyroidism may be caused by: a. Problems following surgery, an autoimmune disorder, or congenital defects b. Heavy exposure to UV, systemic infections, or hypersensitivity reactions c. Infection, trauma, or an autoimmune disorder d. Developmental defects, a deficient diet, or exposure to toxic chemicals

The correct answer is option A

Explanation:

Hypoparaghyroidism occurs when thyroid gland produce little parathyroid hormone.

This is caused by:

1. Injury to the parathyroid glands during thyroid and neck surgery.

2. It is also caused by auto immune disorder. This is as a result when the body's natural defence against invading organisms starts to attack perfectly healthy tissues.

3. Congenital defects: This is as a result when infants are born without parathyroid tissue, that is ability to make thyroid glands or when the mother has hypoparathyroidism.