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: 'speak at', Sentence: 'It is true that Mahmod Ahmadinejad is scheduled to speak at Columbia this Monday .'

SOLUTION: speak

PROBLEM: Given Relationship: 'present at', Sentence: 'Paper presented at the Christian Association of Psychological Studies International Conference , Anaheim , CA.'

SOLUTION: presented

PROBLEM: Given Relationship: 'be son of', Sentence: 'The son of Zeus and Leto , and the twin brother of Artemis , Apollo was the god of music , poetry , dance , intellectual inquiry and the carer of herds and flocks .'

SOLUTION:
son