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.

PBGF LKHZ MNBS HGDT

PBGF

THE LOGIC; 1) PBGF, P → (-11) → B  G → (-1) → F 2) LKHZ, L → (-1) → K H → (-8) → Z 3) MNBS, M → (-1) → N B → (-9) → Z 4) HGDT, H → (-1) → G D → (-10) → T Thus, PBGF is the odd one.