Question: What is the nationality of a basketball player who competed in the 1988 Summer Olympics and won the ACB Finals Most Valuable Player Award twice?
Sentence (from "Arvydas Sabonis"): Playing the center position, Sabonis won a gold medal at the 1988 Summer Olympics in South Korea for the Soviet Union, and later earned bronze medals at the 1992 and 1996 games representing Lithuania.
Relevant evidence: Yes