The logic here is
26 - 11 = 15
33 - 16 = 17
28 - 13 = 15
33 - 18 = 15
The difference between the numbers of all number pairs except in 16 - 33 is 15.
$$\therefore\ $$16 - 33 is the odd number pair among the given number pairs.
Hence, the correct answer is Option B
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