Question Analysis:
First of all, admit that you’ve dealt with stress and that you feel pressure. No one will believe you if you boldly state that you’re immune to pressure or stress. Such an assertion can also give the impression that you don’t take your job seriously enough, so don’t go there.
To answer this question successfully, mention how a little pressure is a helpful motivator for you. Try to provide an example of a time when you've handled stress well in the past, helping you to become a more creative and productive worker. You can also provide examples of how your approach defused pressure and stress for colleagues, helping them to cope better as well.
Above all, don’t appear stressed when you answer this question!