"See so-and-so's comment" doesn't meet the standard for an answer on our site. Answers should be complete in themselves; for example, if BruceET was to delete his comment, your answer would be useless.
It is usually seen as acceptable to
invite the author of the comment to post as an answer, if you feel it is a complete answer to the question, or
to simply post the information in the comment as an answer yourself, expanding on it where necessary to make it a suitable answer (comments are usually overly brief for answers), as long as you credit the source (and as long as the answer doesn't duplicate other answers on site)