Four letter-cluster have been given, out of which three are alike in some manner and one is different. Select the letter-cluster that is different.

SPK JGT PMN GTQ

GTQ

SPK ⇒  S →(-3)→ P→(OPPOSITE) →K JGT ⇒  J →(-3)→ G→(OPPOSITE) →T PMN ⇒ P →(-3)→ M→(OPPOSITE) →N GTQ ⇒ G →(OPPOSITE)→ T→(-3) →Q(ODD)