Table schema:
CREATE TABLE table_name_30 (gp_winner VARCHAR, place VARCHAR, race_winners VARCHAR)

Question: What is the GP winner with a place of genk, with race winners ben adriaenssen / ben van den bogaart?
SQL: SELECT gp_winner FROM table_name_30 WHERE place = "genk" AND race_winners = "ben adriaenssen / ben van den bogaart"