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

FCXB

WTGD ⇒ T →(OPPOSITE)→ G    AND     W →(OPPOSITE)→ D

FCXB ⇒ C →(OPPOSITE)→ X  AND     F →(NOT OPPOSITE)→ B

MJQN ⇒ J →(OPPOSITE)→ Q     AND     M → (OPPOSITE) → N

KHSP ⇒ H →(OPPOSITE)→ S    AND      K →(OPPOSITE)→ H