Answer the following question, with explanation first. Of the following two sentences, which one is against common sense?
Options:
- Sentence A: "Grandma is 85 years old"
- Sentence B: "Grandma is 200 years old this year"

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
The average human lifespan is 78-80 years old.
So, the answer is Sentence B.