In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Context: He was also author of books on the Soviet economy, translated the correspondence of Joseph Stalin, Franklin Roosevelt and Winston Churchill Link Information: Joseph Vissarionovich Stalin (born Ioseb Besarionis dz Jughashvili; 5 March 1953) Question: Which world leader that Obolensky did translation work on their correspondence died first?
Answer: Franklin D. Roosevelt