Citations and sources
Check where a claim in a Rhazes answer came from, open the source behind it, and spot the parts carrying no citation at all.
Updated
Why they are there
Rhazes shows where a claim came from so you can check it rather than take it on trust. This matters most in exactly the situations where you are least able to spot a confident mistake.
Reading them
When a response draws on something, it carries a citation you can select to open the source behind it. Sources sit together in a panel, listed so you can work through them.
When there is no citation
A sentence with nothing attached to it is Rhazes reasoning from its own knowledge rather than quoting a source. That is not automatically wrong, but it is worth noticing when accuracy matters, because there is nothing there to check it against.