Difference between Maida and All purpose flour This one particularly bugs me because the question has almost 60,000 views. I find it vaguely embarrassing. The OP has not been back since two days after posting the question and the person who posted the answer was last seen September 2012. Can we unaccept that answer?
Nope, the OP has the final say, as unfortunate as it is in this case. Probably the best thing for future visitors is to simply edit it into a correct answer. I'll change it to community wiki, to make it clear that it's not owned by the original author anymore, and avoid unfairly giving out rep. Feel free to edit away, if you know the real answer.
I'll upvote a better answer and downvote the accepted answer. Others will too. It bugs me that the OP accepted an incorrect answer but that's how the system works.
I don't think a minor edit will save the wrong answer.
I suggest you answer it yourself and let the votes work their magic. Even if you don't have the big green check, the point difference will be there and you can always mention the accepted answer in the text of your answer, "Contrary to what is stated in the accepted answer..."