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.

Example Input: Given Relationship: 'be bishop of', Sentence: 'The Bishops of Rome petitioned Pope Clement VIII to forbid coffee drinking to all of Christendom .'
Example Output: Bishops

Example Input: 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 .'
Example Output: creator

Example Input: Given Relationship: 'be son of', Sentence: 'God is Christ , the Messiah , the son of Mary . ''
Example Output:
son