<|system|>
Express $0.\overline{5}$ as a common fraction in lowest terms.</s>.
<|user|>
Can you answer based on context?
<|assistant|>
Let $x = 0.\overline{5}$. We then have $$ 10x - x = 5.\overline{5} - 0.\overline{5} = 5 \ \ \Rightarrow \ \ x = \dfrac{5}{9}. $$