Choose the sentence that goes against common sense.
Options:
- Sentence A: "You don't need to buy tickets when you take the train."
- Sentence B: "You need to buy tickets when you take the train."
 Let's be accurate as possible. So think first.

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
Everyone needs to buy tickets when they take the train.
The final answer: Sentence A.