Detailed Instructions: Given two noun phrases (arguments) and relationship between them, form a sentence that expresses theses arguments with the given relationship.
Problem:Relationship: 'be chairman of', Argument/Subject 1: 'greenspan', Argument/Subject 2: 'federal reserve'
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Alan Greenspan , Chairman of the Board of Governors of the Federal Reserve System , gave the conference keynote address .