Choose the sentence that goes against common sense.
Options:
- Sentence A: "It's more comfortable to sit on a chair with a back"
- Sentence B: "It's more comfortable to sit in a chair without a back"
 Let's reason step by step:

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
One cannot relax on a chair without a back. Final answer: Sentence B.