In the following question, some groups of letters are given, all of which, except one, share a common similarity. Choose the odd one out.

Choose the odd one out.

A.

ACHI

B.

DFKL

C.

MNST

D.

OQVW

E.

PRWX

Correct answer is C

In all other groups, the first two letters are alternate, third and fourth letters are consecutive and there is a gap of four letters between the second and third letters.