Question: Who was an adivisor to the eighth leader of the Soviet Union who died in 2006? 
Sentence (from "Mikhail Gorbachev"): Mikhail Sergeyevich Gorbachev, ( ; Russian: Михаи́л Серге́евич Горбачёв ; ] ; born 2 March 1931) is a former Soviet statesman.
Relevant evidence: No