The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are followed in all the number-pairs EXCEPT one. Find that odd number-pair.

36 : 2

The logic followed here Is :

option 1       169 : 10

                  13² = 169

                  13 - 3 = 10

option 2       196 : 11

                  14² = 196

                  14 - 3 = 11

option 3       64 : 5

                  8² = 64

                  8 - 3 = 5

option 4      36 : 5

                     6² = 36

                      6 - 3 = 3 but 5 is given