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: Adric:  We 're outside .
Romana: Pity . I want to be on the inside .
Adric: But I 've just rescued you .
Romana: Thank you , but I have GOT to find out what they 're up to in there . Do you know what a Tharil is ?
Adric: No .
Romana: Well , there 's _ one _ loose on this ship , and they 're terrified of it . It 's like Biroc but horribly burned .

Tharil