Which extra-embryonic membrane acts as extra-embryonic gut?

Explanation

**Step-by-Step Solution:**

1. **Identify the Extra-Embryonic Membranes**: There are four main extra-embryonic membranes in human development: Chorion, Amnion, Allantois, and Yolk Sac.

2. **Understand the Function of Each Membrane**:
- **Chorion**: This is the outermost membrane that provides protection to the embryo from external stress.
- **Amnion**: Located just inside the Chorion, it forms a fluid-filled cavity that cushions the embryo, protecting it from shocks.
- **Allantois**: This membrane develops into a tube-like structure that facilitates gaseous exchange and waste removal between the embryo and the mother.
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