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?
ACB Finals Most Valuable Player Award: The ACB Finals Most Valuable Player Award is an award for the top-tier professional basketball league in Spain, the Spanish ACB League. ACB Finals Most Valuable Player Award:  Since then, only three players have won the award more than once: Arvydas Sabonis (2 times), Juan Carlos Navarro (3 times) and Felipe Reyes (2 times). Arvydas Sabonis: Arvydas Romas Sabonis (born December 19, 1964) is a Lithuanian retired professional basketball player and businessman.
i don't know