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 : 5

option 1        64  : 6

                   6 + 2  = 8

                    8² = 64

option 2         36 : 5

                 5 + 2  = 7

                    7² = 49 but 36 is given (Odd)

option 3       169 : 11

                 11 + 2  = 13

                    13² = 169

option 4        196 : 12

                       12 + 2  = 14

                    14² = 196