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: Cutty:  This is suicide ! And for what ? We have no other bases in this sector .
Captain Garrovick: How many Tressaurians in this sector , Cutty ? You estimated _ twenty _ million .
Cutty: And why do you care after what they 've done ?

Tressaurians