Select the option that is different from the rest.

Option (a): MN, 37$$\rightarrow$$​ M (13) + N (14) = 27

Option (b): RQ, 35 $$\rightarrow$$ R (18) + Q (17) = 35 

Option (c): HI, 17 $$\rightarrow$$ H (8) + I (9) = 17​

Option (d): TS, 39 $$\rightarrow$$ T (20) + S (19) = 39 

The given number for MN is 37, but the actual sum is 27.

All other pairs correctly match their letter sum. except option (a).

Thus, the correct option is (A) MN, 37