Question: Who was the former chairman of a Venezuela-owned American refiner?
Sentence (from "Charles O. Holliday"): Charles Otis "Chad" Holliday, Jr. (born March 9, 1948) is an American businessman, former chairman of Bank of America and former chairman, former chief executive officer and a former director of E. I. du Pont de Nemours and Company (DuPont).
Relevant evidence: No