Hallucinations come up when asking knowledge bases questions, such as "In React’s Canary Fragment refs API, which FragmentInstance method returns a flat array of DOMRect objects for all children?" Or "Over what years did Roubini and Sachs examine 15 OECD countries when assessing trends in tax-to-GDP ratios?" While to me those may seem hyper-specific and unlikely to come up in a real context, students will absolutely ask questions similar to these.