An unprepared student asked his doctor for help getting out of taking an exam. What suggestion did the doctor make?
Doctor: How are you doing?
Patient: Not so great. I have a test in a couple days and I'm not prepared at all!
Doctor: Just be sure to wear a mask.
Patient: It's required. Say, I don't suppose you could write me a note saying that I'm too sick?
Doctor: Are you sick?
Doctor: Then no. However, there's another option. I can't promise it will work, though.
In fact, the doctor's plan was successful and the student was able to reschedule their exam. The student's test-avoidance strategy eventually reached quite a few people. Some professors even shared the story with their own students, encouraging them to give it a try.
Edit: I'm seeing a lot of almost-fitting suggestions. Adding the below hint to make it easier to avoid almost-fitting solutions:
Contrary to what the conversation implies, the doctor in this story has no interest in helping the student avoid taking the exam. Thus, the doctor will not go out of their way to help the student avoid their exam.
Continuing from hint 1: While helping the student avoid taking an exam is not one of the doctor's goals, the doctor does have professional goals. One of those goals has a chance of allowing the student to reschedule their exam, albeit only as a side effect.
What might a doctor do to a healthy patient which has a possibility, but not a guarantee, of preventing the patient from attending class? As a reminder, the title describes this as a routine doctor's visit.