Kidney of adult rabbit is

Options

A. pronephros
B. metanephros
C. mesonephros
D. opisthonephros

Explanation

### Step-by-Step Solution:

1. **Understanding Kidney Development**:
- The kidneys in vertebrates develop in stages: pronephros, mesonephros, and metanephros. Each stage represents a different type of kidney structure and function.

2. **Identifying the Types of Kidneys**:
- **Pronephros**: This is the first stage of kidney development and is the simplest form. It is not functional in adult vertebrates.
- **Mesonephros**: This type of kidney develops after pronephros and is functional in some lower vertebrates like fish and amphibians, but not in adult mammals.
- **Metanephros**: This is the final and most advanced stage of kidney development. It is the functional kidney in adult mammals, including rabbits.

3. **Analyzing the Question**:
- The question specifically asks about the type of kidney present in adult rabbits.

4. **Conclusion**:
- Since adult rabbits possess metanephric kidneys, the correct answer to the question is that the kidney of an adult rabbit is of the metanephros type.

### Final Answer:
The kidney of an adult rabbit is of the metanephros type.

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