Calcium phosphate in the bone is found as  

Options

A. Colloids of hydroxy phosphate
B. Crystals of hydroxyapatite
C. Crystals of calcium carbonate
D. Colloidal solution

Answer

To answer the question "Calcium phosphate in the bone is found as," we need to analyze the options provided and understand the role of calcium phosphate in bone structure.

### Step-by-Step Solution:

1. **Understanding Calcium Phosphate**:
- Calcium phosphate is a family of minerals that contain calcium ions (Ca²⁺) and phosphate ions (PO₄³⁻). It is a significant component of bone tissue.

2. **Identifying the Forms of Calcium Phosphate**:
- Calcium phosphate can exist in various forms, but in the context of bone, it is primarily found as hydroxyapatite.

3. **Reviewing the Options**:
- **Option A: Colloids of hydroxy phosphate**: This refers to a mixture where hydroxy phosphate is dispersed in a colloidal form, but it is not the primary form found in bones.
- **Option B: Crystals of hydroxyapatite**: Hydroxyapatite (HAP) is a naturally occurring mineral form of calcium phosphate and constitutes the largest part of inorganic components in human bones.
- **Option C: Crystals of calcium carbonate**: Calcium carbonate is not a primary component of bone; it is often used as a dietary supplement.
- **Option D: Colloidal solution**: This is a general term for mixtures and does not specifically refer to calcium phosphate in bones.

4. **Selecting the Correct Answer**:
- Based on the analysis, the correct answer is **Option B: Crystals of hydroxyapatite**. This is because hydroxyapatite is the main form of calcium phosphate found in the mineral matrix of bones, providing strength and structure.

### Final Answer:
Calcium phosphate in the bone is found as **crystals of hydroxyapatite**.