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.

the index of refraction of the second medium is higher. i just took the test trust me !