From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

[EX Q]: Given Relationship: 'be president of', Sentence: 'Tomorrow Barack Obama will become president of the United States .'
[EX A]: president

[EX Q]: Given Relationship: 'be country in', Sentence: 'Canada and the countries of the Americas are proceeding with Summits and many economic liberalisation negotiations , which , if realised , will transform the political , environmental , social and economic geography of the Western Hemisphere .'
[EX A]: countries

[EX Q]: Given Relationship: 'be staple food of', Sentence: 'Rice is a main staple of Filipino food .'
[EX A]:
staple