Let's think step by step! One of the following sentences is nonsensical. Which one is it?
Options:
- Sentence A: "Toothpaste can be used to brush teeth."
- Sentence B: "Milk powder can be used to brush teeth."

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
Milk powder has no function of cleaning teeth. The answer: Sentence B.