Question: what year did the winner of the 1992 South African Grand Prix with the CART Indy Car World Series?
Sentence (from "Nigel Mansell"): Mansell was the reigning F1 champion when he moved over to CART, becoming the first person to win the CART title in his debut season, and making him the only person to hold both the World Drivers' Championship and the American open-wheel National Championship simultaneously.
Relevant evidence: No