Answer the following question, with explanation first. One of the following sentences is nonsensical. Which one is it?
Options:
- Sentence A: "Staying up late is helpful for our health."
- Sentence B: "Staying up late is harmful to our health."

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
Staying up late will cause dark circles or blood streak in the white of the eye.
So, the answer is Sentence A.