Which of the following is poisonous snake :-

Options

A. Typhlop
B. Python
C. Hydrophis
D. Eryx

Answer

To determine which of the following snakes is poisonous, we will analyze each option provided:

1. **Typhlops**: This snake is commonly known as the blind snake. It is non-poisonous and primarily feeds on small invertebrates. Therefore, it is not a poisonous snake.

2. **Python**: Pythons are large non-venomous snakes. They are constrictors, meaning they kill their prey by wrapping around them and suffocating them. Hence, pythons are not poisonous.

3. **Aralak**: This term does not directly refer to a well-known snake species. However, if we consider "Aralak" to refer to a specific type of snake that is known to be venomous, we need to verify its classification. In general, many snakes in the family Elapidae (which includes cobras and mambas) are considered poisonous.

4. **Hydrophis**: This is a genus of sea snakes, and they are indeed known to be venomous. Sea snakes possess potent venom and are classified as poisonous.

Based on this analysis, the poisonous snake among the options is **Hydrophis**.

### Final Answer:
**Hydrophis** is the poisonous snake.