What was the most stressful situation you faced at work? How did you handle it?

If you'd faced some stressful situation in your past life, then you can share your experience with the interviewer, but make sure to remain polite and tell your story in a positive way. The interviewer should not get the hint that you are complaining, even though you are complaining.

If you haven't faced such situation in your past, then tell the interviewer that I will manage my work by my own until and unless that will not impact on my work-life balance and I am quite comfortable with the job, but if it is disturbing my mental health then I would like to have a healthy discussion with the supervisor and try to sort that problem.