Explanation:

Certainly! Let's explore tooth enamel and the options provided:

- Tooth Enamel Composition:

- Tooth enamel is primarily made of a mineral called hydroxyapatite.

- Hydroxyapatite is a crystalline structure mostly composed of calcium phosphate, making it incredibly hard and resilient.

- Options:

- Option 1: Calcium Phosphate:

- Correct! It's the primary component of hydroxyapatite in tooth enamel.

- Option 2: Calcium Silicate:

- Not relevant to tooth enamel. Used in ceramics and cements.

- Option 3: Calcium Carbonate:

- Found in bones and shells, but not the main element of enamel.

- Option 4: Calcium Sulphate:

- Known as gypsum; used in plasters but not in tooth enamel.