Doctor: Would you mind if a medical student watches me during the operation?
Georg Marquardt: No, that's fine.
[the doctor beckons the student in. The "student" is an old lady. Georg looks frantically between them]
Georg Marquardt: She is a medical student?
Doctor: Not really, but she has a certain relation to the medical profession.
Georg Marquardt: What is this certain relation?
Doctor: She is my mother.