Why did you choose this firm?

Supposing that BCG is the firm that you are interviewing for, you could go the following way:

1. I have a strong interest in the public sector and in education. Among all consulting companies, BCG is the undisputed leader in these industries. I would love to learn from BCG's enormous experience and solid client contacts.

2. Because BCG has a worldwide employment model, I get to travel and collaborate with colleagues from all around the world. Working with diverse teams gives me fulfillment, and BCG is the ideal environment for this.

3. BCG has employed many of the mentors I admire and respect. I know that BCG would be the ideal location to work to build my talents and advance my career because they have all strongly recommended working there.