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 president of', Sentence: 'On Tuesday , November 4 , 2008 at about 8pm Pacfic Time , the major news networks officially called the election for the President of the United States of America for Democratic Candidate Barack Obama .'
Example Output: President

Example Input: Given Relationship: 'lead', Sentence: 'Clinton led McCain by 29 points in March , 61 % to 32 % .'
Example Output: led

Example Input: Given Relationship: 'present to', Sentence: 'Paper presented at Conference on Computer-Supported Collaborative Learning .'
Example Output:
presented