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: Merlin:  All the magic at my command and I still ca n't rid myself of a common cold .
Arthur King: Do n't feel bad , Merlin ; even the doctors in my time haven't locked that _ one _ yet .

cold