what are all the teams?
societe roc, christian poirot, gelo racing team, wicky racing team, gitanes automobiles ligier, ecurie du nord, auto mazda claude bouchet, ganto racing, guy verrier, beurlys international auto, herve poulain, elf switzerland, sigma automotive co. ltd., joest racing / tebernum, bonnemaison - thiaw, shark team, gitanes automobiles ligier, racing team schulthess, philippe mettetal, jean-yves gadal, jean-claude aubriet, henri greder
who in all was in the gt class?
gelo racing team, ecurie du nord, ganto racing, gelo racing team, guy verrier, beurlys international auto, joest racing / tebernum, bonnemaison - thiaw, jean-yves gadal, henri greder
of those, which was number 57?
ganto racing