Which of the following is an essential mineral?

• A. Vitamin C
• B. Glucose
• C. Calcium
• D. Protein

Answer: (C)

Essential minerals are inorganic nutrients that the body cannot synthesize and must obtain from the diet to support vital functions. Calcium fits this category because it is required in small amounts for strong bones and teeth, and it also supports nerve transmission, muscle contraction, blood clotting, and enzyme activity. These roles rely on calcium being supplied from foods or supplements rather than being produced by the body.

Vitamin C is a vitamin, not a mineral, and is involved in collagen synthesis and antioxidant protection. Glucose is a carbohydrate, providing quick energy. Protein is a macronutrient made of amino acids, important for growth and tissue repair. Calcium’s combination of structural and regulatory roles makes it the essential mineral among these options.