The Parathyroid gland is responsible for regulating the levels of calcium and phosphorus in the body, and a dysfunction in this gland can lead to problems with calcium and phosphorus metabolism.

Explanation:

Calcium and phosphorus are important minerals that play a crucial role in maintaining strong bones, teeth, and overall health. The levels of these minerals in the body are regulated by the parathyroid gland, which is located in the neck and produces a hormone called parathyroid hormone (PTH).

When the levels of calcium in the blood are low, the parathyroid gland releases PTH, which stimulates the bones to release calcium into the bloodstream and the kidneys to reabsorb more calcium. PTH also helps to convert vitamin D into its active form, which enhances the absorption of calcium from the intestines.

On the other hand, when the levels of calcium in the blood are high, the parathyroid gland reduces the production of PTH, which slows down the release of calcium from the bones and the reabsorption of calcium from the kidneys. This helps to maintain a balance of calcium in the body.

If the parathyroid gland is not functioning properly, it can lead to a number of problems related to calcium and phosphorus metabolism, such as:

- Hyperparathyroidism: This is a condition in which the parathyroid gland produces too much PTH, leading to high levels of calcium in the blood. This can cause symptoms such as weakness, fatigue, bone pain, and kidney stones.

- Hypoparathyroidism: This is a condition in which the parathyroid gland produces too little PTH, leading to low levels of calcium in the blood. This can cause symptoms such as muscle cramps, twitching, and numbness or tingling in the hands and feet.

In conclusion, the parathyroid gland plays an important role in regulating the levels of calcium and phosphorus in the body, and a dysfunction in this gland can lead to problems with calcium and phosphorus metabolism.

Because parotid gland help in secretion of salivary amilase ,pancreas help in secretion of insulin and thyroid gland help in secretion of thyroxin hormones and then remaining option is correct.