Find the odd number / letters / word from the given alternative:

by

1236
2346
4566
5686

The answer is D. 5686.

In each of the other options, the sum of the first two digits is equal to the third digit. For example, in 1236, 1 + 2 = 3. In 2346, 2 + 3 = 5. In 4566, 4 + 5 = 9. However, in 5686, 5 + 6 = 11, which is not equal to 8.

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