Detailed Instructions: 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: 'be chairman of', Sentence: 'Alan Greenspan , the chairman of the Federal Reserve Board , has said the central bank was aiming for aneutralpolicy stance , in which the economy was neither helped nor hindered by the central bank .'
Solution:
chairman