Kidney crystals are solid clusters of

Options

A. Calcium nitrate and uric acid
B. Phosphate and uric acid
C. Calcium carbonate and uric acid
D. Calcium metabisulphite and uric acid

Answer

**Step-by-Step Solution:**

1. **Understanding Kidney Crystals**: Kidney crystals, commonly referred to as kidney stones, are solid clusters that form in the kidneys. They can vary in composition based on the substances present in the urine.

2. **Analyzing the Options**: The question provides four options regarding the composition of kidney crystals:
- Option 1: Calcium nitrate and uric acid
- Option 2: Phosphate and uric acid
- Option 3: Calcium carbonate and uric acid
- Option 4: Calcium metabisulphite and uric acid

3. **Evaluating Each Option**:
- **Option 1**: Calcium nitrate is not typically associated with kidney stones.
- **Option 2**: Phosphate (specifically calcium phosphate) and uric acid are indeed known components of kidney stones.
- **Option 3**: Calcium carbonate can form stones, but it is not a primary component of kidney stones.
- **Option 4**: Calcium metabisulphite is not related to kidney stone formation.

4. **Identifying the Correct Answer**: Based on the evaluation, Option 2 (Phosphate and uric acid) is the most accurate representation of the composition of kidney crystals.

5. **Conclusion**: Kidney crystals are solid clusters primarily made up of phosphate (calcium phosphate) and uric acid.

**Final Answer**: Kidney crystals are solid clusters of phosphate and uric acid.

---