Which of the following letter-clusters should replace # and % so that the pattern and relationship followed between the letter-cluster pair on the left side of :: is the same as that on the right side of :: ?
# : RMN :: TOP : %​

Given: # : RMN :: TOP : %

Logic: 1st and 3rd three letters are increasing + 5 place.

Now, we check each options.

Option (a): # = MHI, % = YTU (Follow)​

M + 5 = R, H + 5 = M, I + 5 = N

T + 5 = Y, O + 5 = T, P + 5 = U

Option (b): # = MOU, % = YLU (Not Follow)

M + 5 = R, O + 5 $$\neq$$​ M, U + 5 $$\neq$$​ N

T + 5 = Y, O + 5 $$\neq$$​ L, P + 5 = U

Option (c): # = KJI, % = YMU (Not Follow)​

K + 5 $$\neq$$​ R, J + 5 $$\neq$$​ M, I + 5 = N

T + 5 = Y, O + 5 $$\neq$$​ M, P + 5 = U

Option (d): # = NHI, % = YOK (Not Follow)​

N + 5 $$\neq$$​ R, H + 5 = M, I + 5 = N

T + 5 = Y, O + 5 $$\neq$$ O, P + 5 $$\neq$$​ K

Thus, correct option is (a).