CREATE TABLE table_name_30 (gp_winner VARCHAR(255), place VARCHAR(255), race_winners VARCHAR(255))
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"