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: Lt. Reed:  All we have left is to reset the emitters .
Lieutenant Talas: What 's the frequency ?
Lt. Reed: I 'll do it .
Lieutenant Talas: You do n't trust me .
Lt. Reed: No offence , but when it comes to our weapons frequencies , I would n't trust my own mother .
Lieutenant Talas: Is your mother considered a security risk ?
Lt. Reed: It 's just an expression .
Lieutenant Talas: An odd _ one _ . My mother 's security clearance is higher than mine .

expression