You can use an example from work or your education to address this question. The interviewer is most interested to your response to the pressure rather than the conditions. It's kind of like when you're talking about problems you solved; always better to not focus so much on the actual problem. Here's an example of how to answer this:

"When I was working as an administrator at a busy law office, I had to deal with some very stressed clients. There was one case that was highly sensitive and required me to pay extra attention to detail. I had limited time to prepare the paperwork, but I was still able to support the lawyer and the client by staying calm and carefully providing everything they needed. I set goals daily in order to meet the deadline."

Any situation can be stressful when its crunch-time and you have clients breathing down your neck. Think of a time where you produced your best work under pressure. You got this!