“Why our MBA?” Or: “Tell me why you are interested in this program,” etc. This interview prompt will appear, in some form, early on in your interview.
Make it clear how this MBA will help you to achieve your goals. Your response should include school-specific details, like what classes or experiential learning opportunities you'll take advantage of, what unique resources you’ll utilize that maybe aren't available at other schools, which professors you're eager to learn from, the student clubs you'd like to join, the names of companies you’re interested in that recruit from the program, and maybe even what you like about the area. And don’t forget to bridge these details with your past experiences and future goals to reinforce your interest in these offerings.
Whatever you do, don't say something ingratiating and general: "It's an esteemed program where I'll learn from esteemed professors who lead in their esteemed fields." We're teasing about this phrasing, but go deep rather than broad. Answer the question with a few salient details and you'll be golden.
Related:
Your MBA Interview: Day-of Tips
Your MBA Interview: Prepare a Three-Minute Elevator Pitch