Teacher:Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.
Teacher: Now, understand the problem? Solve this instance: What nationality is Justine Henin, winner of 7 Grand Slam singles titles and an Olympic gold medal, who retired from professional tennis in 2008 when ranked World No. 1 and returned in 2010?
Student:
belgium