premise: How to buy essential oils<br>Think about why you want to use an essential oil. Different oils suit different needs so it's important to know what you wish to achieve by using essential oil. For example, lavender can be used in a diffuser to relax and reduce anxiety and sage essential oil can be used as an antiseptic in wounds or as an anti-inflammatory.
hypothesis: sage essential oil reduces anxiety
reason: Sage essential oil does not reduce anxiety. Lavender oil does. The system is likely misinterpreting which oil reduces anxiety.