@user202729 do nothing? Or if it really bugs you, edit the answer to include the useful bits from the comment into the answer and then custom flag the comment to explain you edited the useful info into the answer, obsoleting the comment.
without a custom flag on the comment the mod might misinterpret your intent
I know there's a small "deleted recent questions" link at the bottom of a user's Questions list if they click through to it from their Activity on their profile. But a new user may not know to do that. And I've read the deleted questions FAQ, but it doesn't seem to address this.
Given this scena...