Answer the following question given this paragraph: 

The two parathyroid glands are located behind the thyroid gland. Parathyroid hormone helps keep the level of calcium in the blood within a narrow range. It stimulates bone cells to dissolve calcium in bone matrix and release it into the blood.


Q: The two parathyroid glands are located behind what gland?

 Choices:

- thymus

- pituitary gland

- hypothalmus

- thyroid

A:
thyroid
