In the given number pairs,
11 - 7 = 4
16 - 12 = 4
18 - 14 = 4
15 - 9 = 6
Difference of numbers is 4 in all number pairs except 9 - 15.
$$\therefore\ $$9 - 15 is the odd number pair among the given number pairs.
Hence, the correct answer is Option D
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