Choose the sentence that goes against common sense.
Options:
- Sentence A: "Mary is walking her dogs."
- Sentence B: "Mary is walking her dinosaurs."
 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
Dinosaurs and Mary did not live in an era.
The final answer: Sentence B.