(11 - 115) , (10 - 90) , (9 - 72) , (8 - 56)
Option:
Justification: In all other pairs, the sum of the two numbers is a perfect square.

(11 - 115) , (10 - 90) , (9 - 72) , (8 - 56)
Justification: In all other pairs, the sum of the two numbers is a perfect square.