Answer the following question, with explanation first. Of the following two sentences, which one is against common sense?
Options:
- Sentence A: "We don't need to wash our hands after going to the toilet."
- Sentence B: "We should wash our hands after going to the toilet."

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
It is unsanitary not to wash hands after going to the toilet.
So, the answer is Sentence A.