Let's think step by step! Of the following two sentences, which one is against common sense?
Options:
- Sentence A: "Gold is very expensive."
- Sentence B: "Gold is very cheap."

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
Gold is very scarce, so it's very expensive. The answer: Sentence B.