For some posts, the answer might be very short or a single line answer. so sometimes users post them in comments instead of as answer.

For example,
Have a look at this [Question](https://drupal.stackexchange.com/questions/112894/number-of-logged-in-users-per-day). [Bala](https://drupal.stackexchange.com/users/12418/bala) left a comment on the post which is the answer for that.

So if I strongly believe that comment is an answer for that, can I elaborate and post that as an answer. So that it would be helpful for future readers.

If I do so, it would looks like I copied answer from comment.