Question: Who was an adivisor to the eighth leader of the Soviet Union who died in 2006? 
Sentence (from "Mikhail Gorbachev"): He was the country's head of state from 1988 until 1991 (titled as Chairman of the Presidium of the Supreme Soviet from 1988 to 1989, as Chairman of the from 1989 to 1990, and as Soviet Union]] from 1990 to 1991).
Relevant evidence: No