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References to the events and people of the 1980s are strewn heavily throughout ; U.S.  President  Ronald Reagan Libyan leader Muammar al-Gaddafi and President of the Soviet Union  Mikhail Gorbachev  are central to many of the jokes .
 title of person: President, Mikhail Gorbachev
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  President, Mikhail Gorbachev 
Answer:
 title of person: President, Mikhail Gorbachev