Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
8.3.1 you should carefully review the description of any experience , event or other host service you intend to book to ensure you ( and any additional guests you are booking for ) meet any minimum age , proficiency , fitness or other requirements which the host has specified in their listing . 

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