Four of the following five pairs follow a similar letter-coding pattern. Identify the one that does not belong to the group.
CRUSH: XIFHS
BLAST: YOZHG
FROWN: UILDM
HAPPY: SMNMB
SNAIL: HMZRO
Question: Which of the following pairs is the odd one out?

Given: 

CRUSH: XIFHS
BLAST: YOZHG
FROWN: UILDM
HAPPY: SMNMB
SNAIL: HMZRO

Logic: Opposite letters are given.

For, CRUSH: XIFHS

C = X, R = I, U = F, S = H, H = S
For, BLAST: YOZHG

B = Y, L = O, A = Z, S = H, T = G
For, FROWN: UILDM

F = U, R = I, O = L, W = D, N = M
For, HAPPY: SMNMB

H = S, A $$\neq$$​ M, P $$\neq$$​ N, P $$\neq$$​ M, Y = B
For, SNAIL: HMZRO

S = H, N = M, A = Z, I = R, L = O

So, HAPPY: SMNMB is odd one out.

Thus, correct option is (c).