This has become the mantra of every medical student, intern, and resident wanting to appear smart on rounds and conferences, of every attending intent on shooting down a team member's suggestion. Five, ten years ago it might have have signaled genuine interest. Now it means, usually, "I don't know anything about the subject, but I'm still calling you out on (what I think is) your BS. Here, look at me! I am evidence-based!"
No, nobody has posed me that question in quite a while, and I don't remember ever asking it in any context1. But, honestly, except for a few very well-known examples listed in this excellent post, you can find "evidence" in the medical literature to back up any claim. Off-the-cuff conversations during lectures and rounds are not the best place to dissect them, especially when one side has seniority.
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Although I understand asking questions means showing interest, I've always preferred looking things up myself. This would make me appear either very smart or very dumb, depending on whatever subcontious impression I made on the person in the first few minutes of us meeting. Try to use the halo effect to your advantage. ↩