Four number-pairs are given out of which three are alike in a certain way and one is different. Select the number-pair that is different from the rest.

5 : 7

Except option 1 ,others are following the particular pattern

5 : 7 - Both are the Consecutive prime number.(odd)

17 : 23  - Both are not the Consecutive prime number there are 19 in the middle

13 : 19 - Both are not the Consecutive prime number there are 17  in the middle

31 : 41 - Both are not the Consecutive prime number there are 37 in the middle