CREATE TABLE table_49574 ("Date" TEXT, "Place" TEXT, "Race winners" TEXT, "GP winner" TEXT, "Source" TEXT)

What is the GP winner for the Race winners valentin giraud / nicolas musset, and a place genk?
SELECT "GP winner" FROM table_49574 WHERE "Race winners" = 'valentin giraud / nicolas musset' AND "Place" = 'genk'
SELECT "GP winner" FROM "table_49574" WHERE "Place" = 'genk' AND "Race winners" = 'valentin giraud / nicolas musset'