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.
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Question: Given Relationship: 'be president of', Sentence: 'Barrack Obama has finally got elected as the President of the United States of America , after months of hard work and his unwavering faith in the electorate .'

Answer: President


Question: Given Relationship: 'be build on', Sentence: 'The Parthenon is the largest and most important building on the Acropolis .'

Answer: building


Question: Given Relationship: 'be name for', Sentence: 'Rapa Nui is another name for Easter Island .'

Answer:
name