Which mineral is essential for the maintenance of healthy bone density and is also involved in the regulation of muscle function?

A Potassium
B Magnesium
C Calcium ✓
D Phosphorus

Explanation

Calcium is a mineral that is essential for building and maintaining strong bones and teeth, and also plays a critical role in muscle function and nerve transmission.

Source

National Institutes of Health
Minerals and Trace Elements Nutrition and Biochemistry Calcium Easy MEDICAL Confidence: high