Egg laying mammal is

Options

A. Armedillo
B. Duck billed platypus
C. Pangolin
D. All above

Answer

### Step-by-Step Solution:

1. **Understanding Egg-Laying Mammals**:
- Egg-laying mammals are classified under a specific group known as monotremes. Monotremes are unique among mammals because they lay eggs instead of giving birth to live young.

2. **Identifying Monotremes**:
- The primary examples of monotremes include the duck-billed platypus and several species of echidnas.

3. **Analyzing the Options**:
- Given the options: armadillo, duck-billed platypus, pangolin, and all-of-the-bow, we need to identify which of these is a monotreme.

4. **Evaluating Each Option**:
- **Armadillo**: This is a placental mammal, not a monotreme.
- **Duck-billed Platypus**: This is indeed a monotreme and is known for laying eggs.
- **Pangolin**: This is also a placental mammal and does not lay eggs.
- **All-of-the-bow**: This option is not a recognized category in mammalian classification.

5. **Conclusion**:
- The only egg-laying mammal from the provided options is the duck-billed platypus. Therefore, the correct answer to the question "Egg laying mammal is" is the **duck-billed platypus**.

### Final Answer:
The egg-laying mammal is the **duck-billed platypus**.

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