Perhaps that's not the question you should ask. You might want to ask "what is your advice based on?" instead. If you do so, you evaluate the conclusion by focusing on the quality of the argument, not features of the argumentator. You would agree, I suppose, that good medical advice could be given by non-doctors, and bad medical advice by doctors.

That would be a follow up question if the answer to the first question is “yes.”

If it's an MD you can substitute "take an ibuprofen and see if it goes away", otherwise proceed.