See question below:
Of the following two sentences, which one is against common sense?
Options:
- Sentence A: "he typed on his computer using a piano"
- Sentence B: "he typed on his computer using a keyboard"

Reason slowly and give your answer.

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 piano is too large to place on a computer.
The final answer: Sentence A.