Do you even need ai? What about just a basic system where you type in some keywords like the symptom presented, it queries a known good source like the physicia

Do you even need ai? What about just a basic system where you type in some keywords like the symptom presented, it queries a known good source like the physicians desk reference or something, and returns results with a likelihood score to match your keywords? Such a systems seems like it would be useful and also would not need an ai model or expensive training to create.