Mammal which contains nucleated red blood cell is:

Options

A. man
B. camel
C. monkey
D. rabbit

Answer

**Step-by-Step Solution:**

1. **Understanding Red Blood Cells (RBCs):**
- In most mammals, red blood cells are typically biconcave and lack a nucleus when they are mature. This is a characteristic feature of mammalian RBCs.

2. **Identifying Exceptions:**
- While most mammals have unnucleated RBCs, there are exceptions. We need to identify which mammals retain nucleated red blood cells.

3. **Analyzing Different Mammals:**
- **Camels:** They have unnucleated red blood cells, similar to most mammals.
- **Monkeys:** In contrast, monkeys are known to have nucleated red blood cells even in their mature state.
- **Rabbits:** Like camels, rabbits also have unnucleated red blood cells.

4. **Conclusion:**
- Based on the analysis, the only mammal among the options provided that contains nucleated red blood cells is the monkey.

5. **Final Answer:**
- The mammal which contains nucleated red blood cells is the **monkey**.

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