Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Vancouver, British Columbia (CNN) -- Many kids dream of being in the Olympics one day. When U.S. bobsledder Bill Schuffenhauer was a child in Salt Lake City, Utah, he had no idea the Olympics even existed. All he knew was his parents were drug addicts, that his mother was a prostitute who was often beaten in front of him. He knew that if he was going to survive, he had to do whatever it took to make it. He stole from people; he ate from garbage cans; he got locked up in juvenile detention for breaking into a bike shop when he was trying to get something he could sell for money so he could eat.As a child, bobsledder Bill Schuffenhauer often lived on the streetsHis mother and stepfather were addictsHe turned to athletics in junior high and became a star decathleteAfter his track career ended, he tried out and made bobsled team that won silver in 2002 
 Question:One of the Olympic team members on the top _ four-man team tested positive for steroids, so Schuffenhauer was called into duty.

U.S.