Definition: You are given a sentence and a question in the input. If the information provided in the sentence is enough to answer the question, label "Yes", otherwise label "No". Do not use any facts other than those provided in the sentence while labeling "Yes" or "No". There are only two types of valid responses: Yes and No.
Input: 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?

Yes.