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.

Q: Given Relationship: 'be president of', Sentence: 'Barack Obama elected the 44th President of the United States .'

A: President
****
Q: Given Relationship: 'be grandfather of', Sentence: 'George III was also the grandfather of Queen Victoria , who was the daughter of his fourth son , Edward Augustus , the Duke of Kent .'

A: grandfather
****
Q: Given Relationship: 'be carrier of', Sentence: 'Gulf Air is the national carrier airline of Bahrain and Oman .'

A:
carrier
****