I am currently only interviewing at investment banks; I am not interested in any other field at the moment. At the moment I am only interviewing at 2 other investment banks.

NOTE: Whether it's true or not, we strongly recommend that you state that you are only interested in investment banking. If the interviewer finds out you are evaluating other fields, he may question how serious you are about banking. Also, if you can name the other firms you are interviewing with, feel free to do so. But make sure not to fabricate any other interviews. Wall Street is a small place and bankers have friends at almost every other bank. There is a very good chance your lie will be caught, and it will be an embarrassing end for your chances with that bank.