A multiple choice homework question is posted, of which only two answer choices fit even the most obvious requirements, and it is then a simple matter to figure out which actually matches the problem givens of the problem description.
The asker makes no attempt to find their own solution.
A new poster arrives and posts a deeply erroneous answer proposing a solution not even remotely plausible, and vehemently defends it against comments explaining the error for hours.
A moderator then "relocates" all of the comments explaining the error to chat, so at basic level the question is left with an upvoted wrong answer impressively full of formulas and expansive reasoning... but simply wrong.
How as a community dedicated to technical accuracy do we handle this?
An answer cannot really be posted to rebut the wrong answer, because answers are not permitted to comment on other answers, but only address the question - pointing out the error in an answer is the role of comments.
The actual correct answer to the homework problem itself should not be posted; that would do a dis-service to the asker's education. And substantial hints leading to the answer are already there in comments on the question, so getting the right answer only needs a tiny bit of the asker's effort.
We could simply close the question because it is unattempted homework. I've voted to do so, but that seems like administratively dodging the issue, when the actual answer to the physical situation is quite clear; if we're going to be leaving an answer visible to the world, it had better not be a wrong one.
What process are we going to use to stop showing a wrong answer as our community's response to this question?