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.

Given Relationship: 'be chairman of', Sentence: 'Alan Greenspan , the Chairman of the U.S. Federal Reserve , the current U.S. administration , and U.S. politicians of all stripes could teach a few lessons to those who dictated the level of inflation ahead of them .'
Chairman

Given Relationship: 'be language of', Sentence: 'Gaelic remained the language of the Kings of Scotland for centuries though after 1100 English was introduced in the Court by the hand of Margaret Queen to Malcolm Canmore and the daughter of the king of the Angles .'
language

Given Relationship: 'be columnist for', Sentence: 'David Ignatius is a columnist for the Washington Post .'

columnist