Hello. I just responded that to this one with "Are the doctors' feet hurting?" and was told that it was correct, but there's a typo in "doctors'". There is not - the apostrophe is necessary for the genitive plural.
While I'm at it, there is a similar error when one writes "no-one" which is correct, or "noone" which is awkward but not incorrect. "No one" (in the sense of "nobody") which is the preferred answer, is not correct.
Both of these arise when using via a browser, not an app.