This is a brain teaser. If a doctor can't write a doctoral thesis, he won't get a doctor or a master's degree. Doctor Strange in this question is just a distraction, reminiscent of the movie character Doctor Strange.

Doctor Strange is a fantasy action movie produced by Marvel Pictures and Disney Pictures. It tells the story of Steven strange, a neurosurgeon, who lost his hands in a car accident. Finally, with the help of the ancient master, he became Doctor Strange with extraordinary magic.