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: 'convert to', Sentence: 'After it converts ATP to ADP , the level of the latter accumulates outside the cell and the purine can bind to a purine receptor called P2Y1 .'

SOLUTION: converts

PROBLEM: Given Relationship: 'be chair by', Sentence: 'The Board Treasurer is the Finance Committee chair .'

SOLUTION: chair

PROBLEM: Given Relationship: 'cause', Sentence: 'Many more maintain that HIV cannot cause AIDS alone , but may need additional , unidentified factors .'

SOLUTION:
cause