Question

Magnesium oxide is not used in:

• A. refractive industry
• B. medicine
• C. construction
• D. none of these

Answer 1

The correct option is D none of these

Option $\left(D\right)$ is correct.

Magnesium oxide is a mineral supplement used to treat or prevent low levels of magnesium in the blood. Magnesium is important for many systems in the body, but it is especially vital for healthy muscles and bones. Some people use it as an antacid to relieve heartburn, sour stomach, or acid indigestion. It also may be used as a laxative for short-term, rapid emptying of the bowel. It is available without a prescription.