Of the following two sentences, which one is against common sense?
Options:
- Sentence A: "a kilo of iron is heavier than a kilo of cotton"
- Sentence B: "a kilo of iron is as heavy as a kilo of cotton"
 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
A kilo is the same wight no matter what object is being weighed.
The final answer: Sentence A.