Which of the following is not a true snake ?

Options

A. Tree snake
B. Glass snake
C. Blind snake
D. Sea snake

Answer

To determine which of the following is not a true snake, we will analyze each option provided: tree snake, glass snake, blind snake, and sea snake.

### Step-by-Step Solution:

1. **Understand the Definition of True Snakes**:
True snakes belong to the suborder Serpentes, which includes all species commonly recognized as snakes.

2. **Analyze Each Option**:
- **Tree Snake**: This is a type of true snake that is adapted to living in trees. It belongs to the family Colubridae and is indeed a snake.
- **Glass Snake**: This is a common name for a legless lizard belonging to the genus Ophisaurus. It is not a true snake but rather a lizard that resembles a snake.
- **Blind Snake**: This is a type of true snake that is adapted to a burrowing lifestyle. It belongs to the family Typhlopidae and is indeed a snake.
- **Sea Snake**: This is also a true snake, belonging to the subfamily Hydrophiinae, which is adapted to marine environments.

3. **Identify the Correct Answer**:
From the analysis, the glass snake is not a true snake; it is a legless lizard. Therefore, the correct answer to the question is **glass snake**.

### Final Answer:
The option that is not a true snake is **glass snake**.

---