Explanation:

Introduction:
In this question, we are given four options - book, television, pen, and eraser. We need to identify the odd one out among these options.

Analysis:
To solve this question, we need to look for a unique characteristic or property that differentiates one option from the others. Let's analyze each option:

1) Book: A book is a written or printed work consisting of pages glued or sewn together along one side. It is used for reading, writing, or reference purposes.

2) Television: Television is an electronic device used for receiving and displaying broadcast signals.

3) Pen: A pen is a writing instrument that uses ink to leave a mark on a surface.

4) Eraser: An eraser is a tool used to remove pencil or pen marks from paper or other surfaces.

Identifying the Odd One Out:
From the given options, the odd one out is television because it is the only option that is not directly related to writing or reading. Books, pens, and erasers are all commonly used in the process of writing or reading, but television is an electronic device used for entertainment purposes.

Conclusion:
In conclusion, among the given options - book, television, pen, and eraser, the odd one out is television. This is because it is not directly related to writing or reading, unlike the other options.