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I think everyone is bringing up good points, but I do think it's important point to keep in mind that it is the students job to be reading up on any clerkship they are starting. Just because it is an elective, doesn't mean you should slack off and not prepare for cases. You should be wanting to learn as much as possible from that elective. I think browsing a basic anesthesia for beginners book could have taught the student these answers had they tried to do some pre-reading before starting the elective (like anesthesia secrets for medical students which you can find online).
I honestly think you just got one of the lower performing students bc most students should be able to understand after you explain it to them (which seems like it didn't happen this time). I don't think this situation should be generalized to all of medical students though (in my opinion). Hopefully you get some more knowledgeable ones next time!
A lot of people do an anesthesia elective to get some intubations and go home early. So they get the impression that anesthesia is easy and the lifestyle is great