1746
- 1988 : With the advent of reform under Soviet leader  Mikhail Gorbachev  the couple returns to the  Soviet Union  .
 Mikhail Gorbachev, Soviet Union
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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} 
Answer:
 Mikhail Gorbachev, Soviet Union