Definition: In this task you will be given a question and a passage. You need to determine if the answer to the question is contained in the passage. If the answer can be found in the passage you should output 'True'. If the answer cannot be found in the passage you should output 'False'.
Input: Passage: 'Freestyle skiing was a demonstration sport at the 1988 Winter Olympics, with moguls, aerials, and ballet events. Moguls became an official medal sport at the 1992 games, while aerials and ballet were still demonstration events. At the 1994 games, aerials also became an official medal event and the ski ballet competition was dropped. For the 2010 Winter Olympics, ski cross was added to the program while for the 2014 Winter Olympics half-pipe and slopestyle were added.'. Question: 'when did freestyle skiing become an olympic sport'.

True