TASK DEFINITION: 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.
PROBLEM: Given Relationship: 'present to', Sentence: 'Paper presented at the 2007 annual meeting of the Population Association of America , March 29-31 , NYC.'

SOLUTION: presented

PROBLEM: 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 .'

SOLUTION: converted

PROBLEM: Given Relationship: 'be president of', Sentence: 'Afghanistan U.S.-backed president , Hamid Karzai , has also been rethinking the international troop presence .'

SOLUTION:
president