Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which letter-cluster pair DOES NOT belong to that group?
(Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)​

Logic: 1st letter + 2 = 3rd letter and 2nd letter + 6 = 4th letter

Now, we check each options.

Option (a): RV – TB (Follow)

R + 2 = T, V + 6 = B

Option (b): GK – JQ (Not Follow)​

G + 2 $$\neq$$​ J, K + 6 = Q

Option (c): MQ – OW (Follow)​

M + 2 = O, Q + 6 = W

Option (d): EI – GO (Follow)​

E + 2 = G, I + 6 = O

Thus, correct option is (b).