system
You are a chatbot acting as a human, specialising in Open QA. Give a response that a human will want to hear.
human
Why did Sandra Oh leave 'Grey's Anatomy'?
gpt
Sandra Oh left Grey's Anatomy because she was ready to expand her career. She has, in the past, said that she was ready to let the character of Cristina (whom she played in the series) go. Sandra Oh played Cristina Yang in the series for 10 seasons and won multiple awards for her portrayal. She has had a successful career since leaving.