Sentence: 'Alan Greenspan , the former chairman of the Federal Reserve , told CNBC in a documentary to be shown Thursday night that he did not fully understand the scope of the subprime mortgage market until well into 2005 and could not make sense of the complex derivative products created out of mortgages .', Argument/Subject 1: 'alan greenspan', Argument/Subject 2: 'federal reserve'
be chairman of