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.

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

Now, we check each options.

Option (a): RS - VO (Follow)

R + 4 = V and S - 4 = O

Option (b): NS - RO (Follow)​

N + 4 = R and S - 4 = O

Option (c): LH - PC (Not Follow)​

L + 4 = P and H - 4 $$\neq$$​ C

Option (d): RX - VT (Follow)​

R + 4 = V and X - 4 = T

Thus, correct option is (c).