Human kindey is:

Options

A. Metanephric
B. Mesonephric
C. Protonephric
D. Archinephric

Answer

### Step-by-Step Solution:

1. **Understanding the Types of Kidneys**:
- There are different types of kidneys found in various organisms. In humans, the kidneys are highly modified and can be classified into different types based on their development stages.

2. **Identifying the Types of Kidneys in Humans**:
- The four types of kidneys discussed are:
- **Metanephric Kidney**: This is the most mature form of kidney and is found in adult humans and mammals.
- **Mesonephric Kidney**: This type is found in the embryonic stage of humans and mammals, but it is less developed than the metanephric kidney.
- **Protonephric Kidney**: This is a primitive type of kidney found in lower organisms, such as Cyclostomata and Jawfish, and is not present in humans.
- **Archinephric Kidney**: This is the most primitive form of kidney, found in lower invertebrates like hagfish, and is also not present in humans.

3. **Conclusion**:
- Based on the classification, the only type of kidney that is found in adult humans is the **Metanephric Kidney**. Therefore, the correct answer to the question "Human kidney is:" is **Metanephric Kidney**.