The conversation between human and AI assistant.
[|Human|] In this task, you need to identify the source of the sentence from the choices below.

Output should be chosen from:
- Newspaper
- Textbook
- Online article
- Encyclopedia
[|AI|] Encyclopedia
[|Human|] 
In this task, you need to identify the source of the sentence from the choices below.

Output should be chosen from:
- Newspaper
- Textbook
- Online article
- Encyclopedia