What is your greatest weakness? What are you doing to improve it?

Go deep in a way that exhibits you are taking your career seriously. A well-intentioned shortcoming, or a growth opportunity you've self-identified that is integral to your career goals, would be a good example.

"I'm too self-critical. I labor too long on perfecting a slogan. Early in my career, I missed a couple of deadlines because I couldn't stop revising the slogan I was working on. Looking back, I think the first iteration was better than the final. I've gotten much better at governing this, but I feel like I have further to go."

Choose shortcomings that benefit the greater good. The best examples are those that have positive and negative sides.