Your interviewer is curious how you "stay ahead in a rapidly changing world" to ensure you are a trusted and reliable resource for your clients. As they state online, their "people are continually sought out by global, local and industry media for their unique insights and expert perspectives." Share the resources you use to stay informed and current. Also, consider subscribing to Bain Insights, their "monthly look at the critical issues facing global businesses." Doing so will offer further insights into your interview questions and the information they offer their clients.