Use reasoning to lead to the answer of the following question:
Of the following two sentences, which one is against common sense?\nOptions:\n- Sentence A: "We don't need to wash our hands after going to the toilet."\n- Sentence B: "We should wash our hands after going to the toilet."\n

Sentence A
It is unsanitary not to wash hands after going to the toilet.

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The final answer: Sentence A