This answer, from a new user, to the question, Anet A8 reading 739°C from the extruder thermistor!, quite clearly should have been posted as a question and referred back to the OPs question. The answer appears to have been provided by Toonis, in a comment.
Any idea as to how an answer can be converted to question, and then have the comment converted to an answer - without having to resort to the poster of the answer delete the answer and have them re-post it as a question, and then get Toonis to submit an answer?
Obviously, mods do not have a big magic button to do this automatically... and it would seem that we have to delete it, and ask the new user to post a new question. See also Is it acceptable to post questions to the OP as an answer?