Answer the following question, with explanation first. Of the below sentences, which one does *not* make sense?
Options:
- Sentence A: "Sam's hair gradually turns green as he gets older"
- Sentence B: "Sam's hair gradually turns white as he gets older"

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
People's hair turns gray as they get older.
So, the answer is Sentence A.