Three of the following four are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group?

(NOTE: The odd one out is not based on the number of vowels or consonants in the word)​​

Logic: 1st letter + 4 = 2nd letter and 2nd letter - 1 = 3rd letter

Now, we check each options.

Option (a): UYX (Follow)

U + 4 = Y, Y - 1 = X

Option (b): BFE (Follow)​

B + 4 = F, F - 1 = E

Option (c): IML (Follow)​

I + 4 = M, M - 1 = L

Option (d): OST (Not Follow)​

O + 4 = S, S - 1 $$\neq$$ T​

Thus, correct option is (d).