Question: Who is a computer scientist, Anatoly Karatsuba or Leonid Levin?
{'answer': 'Leonid Anatolievich Levin ( ; Russian: Леони́д Анато́льевич Ле́вин ; Ukrainian: Леоні́д Анато́лійович Ле́він ; born November 2, 1948) is a Soviet-American computer scientist.', 'supporting_facts': [['Anatoly Karatsuba', 0], ['Leonid Levin', 0]]}