I'm looking through a lot of the unanswered questions and it appears some of them have answers in the comments. So what is the solution for these?
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4 options that I see
You could leave a comment, asking the author to make it an answer.
If that results in nothing, and if you can construct a good answer based on the information in the comments, by all means go ahead. Keep in mind though that comments don't always make for good answers. So try to avoid merely copying the comment into an answer.
Comments are mean to clarify question and give suggestion for answer, but it does not mean that it is correct answer.
If it's comment, than user who commented might be not sure with answer.
Also, SO have restriction for comment, so all new users cannot comment..
But anytime user who has questioned can ask the user who commented to put it as answer and mark it as correct answer and mark it correct.