Concept:The second number is such that its square root minus 5 gives the first number.Explanation:For the left pair, the second number is 529.529​=23Subtract 5 from 23:23−5=18So, X=18.For the right pair, the first number is 21.Using the same relation: Y​−5=21Add 5 to both sides:Y​=21+5=26Square both sides:Y=262=676Answer:X=18, Y=676Correct option: D.