TASK DEFINITION: You are given a sentence and a question in the input. The information provided in the sentence should be enough to answer the question. You're expected to write the correct answer. Do not use any facts other than those provided in the sentence.
PROBLEM: Sentence: On the other hand , '' Happy '' is a young idealist who volunteers after his friend is killed by fanatical fellow prisoners for voicing doubts about the war 's outcome .
Question: Who was the young idealist espionage officer that later posed as a medic returning to his unit?

SOLUTION: Happy.

PROBLEM: Sentence: This is your new classroom, Roberto.
Question: What did Miss Washington say when she first saw Roberto and his mother?

SOLUTION: This is your new classroom.

PROBLEM: Sentence: Until one day the red ball spoke up and got all the other colored balls together and they took the air from the purple ball and put it in the green ball.
Question: What color ball was the third brought up in the story?

SOLUTION:
green ball.