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: Gen. Mitchell:  I wonder if you doctors understand going through channels , military - wise speaking .
Trapper: Sir , we started with a captain , went on to a major , then to a colonel .
Hawkeye: On the way , we 've encountered oral compulsiveness , raging paranoia , and a colonel who 's shipping Korea to Switzerland one dollar at a time .
Trapper: Which makes you the next contestant , Colonel .
Hawkeye: And the subject you 've chosen is " Incubators . "
Trapper: And we need _ one _ .

Incubators