Four letter-pairs have been given, out of which three are alike in some manner and one is different. Select the odd one.

Let's analyzed the options:

(a) U-Z → U + 5= Z 

(b) T-X → T + 4= X

(c) L-P → L + 4= P

(d) A-E → A + 4= E

Three pairs follow +4 pattern, but U-Z follows +5

Therefore, U-Z is the odd one out in among the options.

Thus, the correct option is (a)