Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
this website may contain hyperlinks to websites operated by parties other than tripadvisor . 

```
. OPTIONS: ['None' 'Contract by using' 'Unilateral change' 'Jurisdiction'
 'Arbitration' 'Choice of law' 'Limitation of liability'
 'Unilateral termination' 'Content removal'].