In the following question, four letter pairs are given. The letters on left side of (–) is related to the letters on the right side of (–) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

Correct option is A

Solution:
Option a: OPS – QMR
O to Q: +2
P to M: -3
S to R: -1
Option b: JZS – LWT
J to L: +2
Z to W: -3
S to T: +1
Option c: TJC – VGD
T to V: +2
J to G: -3
C to D: +1
Option d: DTM – FQN
D to F: +2
T to Q: -3
M to N: +1
Conclusion
In options b, c, and d, the third letter moves forward by +1. However, in option a, the third letter moves back by -1.
Answer
The correct answer is: OPS – QMR