Being able to operate in stressful situations is essential in nearly every workplace these days. If you operate well when the pressure is on, give examples of high-octane work environments you have been in and how you have achieved within that.
You might cope reasonably well with pressure, but tend to organise your workflow and priorities to ensure you don't leave yourself open to out-of-control situations. In this case give an example of a time you were faced with a stressful situation and rose to the challenge. Be specific – describe the situation, your response and the outcome. Aim to show that you remained in control of the situation, stayed calm and communicated effectively throughout.