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: 'discover', Sentence: 'They were all established in Polynesia before Columbus discovered America , and hence could not have been introduced by later Spanish vessels .'

SOLUTION: discovered

PROBLEM: Given Relationship: 'be creator of', Sentence: 'Bjarne Stroustrup is the creator of C++ , one of the most widely used languages that allows object-oriented programming .'

SOLUTION: creator

PROBLEM: Given Relationship: 'be chairman of', Sentence: 'Prior to joining American Progress , Alexandra worked as a legislative assistant on the Senate Banking Committee for chairman Chris Dodd primarily on housing-related issues .'

SOLUTION:
chairman