Pick the mammal with true placenta

Options

A. Platypus
B. Echidna
C. Kangaroo
D. Mongoose.

Answer

To determine which mammal has a true placenta, we can follow these steps:

1. **Understand the Types of Mammals**: Mammals are generally classified into three groups: monotremes, marsupials, and placental mammals (eutherians).

2. **Identify the Mammals in the Options**: The options given are:
- Platypus
- Echidna
- Kangaroo
- Mongoose

3. **Classify Each Mammal**:
- **Platypus**: This is a monotreme, which means it lays eggs and does not have a true placenta.
- **Echidna**: Another monotreme, also lays eggs and lacks a true placenta.
- **Kangaroo**: This is a marsupial, which has a very rudimentary placenta but is not classified as having a true placenta.
- **Mongoose**: This is a placental mammal (eutherian) and has a true placenta.

4. **Conclusion**: Based on the classification, the mammal with a true placenta is the **mongoose**.

### Final Answer:
The mammal with a true placenta is the **mongoose**.