The interviewers ask this question to gain insight into your personality and see that you have a healthy work/life balance. It is best to mention hobbies that showcase your strengths, skills, and passion that can transfer to your job as a general surgeon. For example, if one of your hobbies is volunteering at the local food bank, it shows the interviewers that you enjoy helping people and are empathetic and compassionate. Mention several hobbies and why you enjoy them while avoiding interests that could be construed as unprofessional.