Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Batman:  Poor devil . Forced to live in an air - conditioned suit that keeps his body temperature down to fifty degrees below _ zero _ . No wonder his mind is warped .

degrees