Nucleated RBCs can be located in

Options

A. Rat
B. Cat
C. Frog
D. Rabbit

Answer

**Step-by-Step Solution:**

1. **Understanding Nucleated RBCs**: Red blood cells (RBCs) typically do not have a nucleus in mammals; however, some animals, especially in the lower vertebrates, have nucleated RBCs.

2. **Identifying the Options**: The options given are:
- A) Rat
- B) Cat
- C) Frog
- D) Rabbit

3. **Analyzing Each Option**:
- **Rat**: Rats are mammals, and like most mammals, their RBCs are anucleated (lack a nucleus).
- **Cat**: Similar to rats, cats are also mammals, and their RBCs do not contain a nucleus.
- **Frog**: Frogs are amphibians, and their RBCs are nucleated, meaning they do have a nucleus.
- **Rabbit**: Rabbits are mammals as well, and their RBCs are anucleated.

4. **Conclusion**: Among the options provided, the only animal that has nucleated RBCs is the frog.

5. **Final Answer**: The correct answer is **C) Frog**.

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