Solution
The logic here is
2 + 6 + 8 = 16
2 + 4 + 6 = 12
3 + 5 + 7 = 15
5 + 7 + 9 = 21
In all number pairs except 579 - 23, second number is the sum of digits of first number.
$$\therefore\ $$579 - 23 is the odd number pair among the given number pairs.
Hence, the correct answer is Option D
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