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.

Given Relationship: 'be president of', Sentence: 'Now George W. Bush is the President of the United States .'
President

Given Relationship: 'be convert to', Sentence: 'Not long after it had been sacked by Totila and its walls razed , Benevento became the seat of a powerful Lombard duchy , which soon converted from Arianism to Trinitarian Christianity .'
converted

Given Relationship: 'be chairman of', Sentence: 'US Federal Reserve chairman Ben Bernanke has said an economic stimulus alone will not be enough to promote a lasting recovery and that further steps to help banks may be needed .'

chairman