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.

DLRT

The logic followed here is: Sum of the positional values of the letters is equal to 50, as shown below

(1)  D     L      R     T

      4 + 12 + 18 + 20 = 54

(2) H     K      M     R

     8 + 11 + 13 + 18 = 50

(1)  F     M      N     Q

      6 + 13 + 14 + 17 = 50

(2) B     J      P     V

     2 + 10 + 16 + 22 = 50

Therefore, DLRT is the odd one