In adult Frog, the kidney is

Options

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

Explanation

**Step-by-Step Solution:**

1. **Identify the Question:** The question asks about the type of kidney present in adult frogs.

2. **Understand the Types of Kidneys:** There are three main types of kidneys in vertebrates:
- Pronephric
- Mesonephric
- Metanephric

3. **Define Each Type:**
- **Pronephric Kidney:** This is the most primitive type and is usually functional only in embryos.
- **Mesonephric Kidney:** This type is functional in both embryos and adults of some species, including amphibians.
- **Metanephric Kidney:** This is the most advanced type, typically found in adult reptiles, birds, and mammals.

4. **Focus on Adult Frogs:** In adult frogs, the kidneys are of the metanephric type. This means they are more advanced than the mesonephric type and are adapted for the adult's life stage.

5. **Conclusion:** Therefore, the correct answer to the question is that in adult frogs, the kidney is of the metanephric type.

**Final Answer:** In adult frog, the kidney is metanephric.

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