Employees who love their jobs naturally recommend their company to their friends and peers. The same is true for people in leadership positions -- people naturally try to bring on board talented people they previously worked with. They've built relationships, developed trust, and shown a level of competence that made someone go out of their way to follow them to a new organization.
Example: “Making a meaningful difference in the lives of my patients and their families motivate me to strive for excellence in everything I do. I look forward to seeing their reaction when we get a positive outcome that will change their lives forever. Like the family of a young boy we treated last year. At eight years old, he had experienced rapid weight gain and signs of depression. His parents described him as a usually joyful child, but now he seemed disengaged and uninterested in his typical schedule. In the end, we determined that it was hypothyroidism which is, of course, controllable with medication. The boy is adjusting well to the treatment and has returned to his joyful self. That’s why I became a nurse and why I’m pursuing a position in pediatrics.”
Of course, if you have an issue that is very important to you that could be a deal-breaker (like company culture), you can mention it. Just be prepared for them to take one extreme or the other. For example, maybe you only want to work for companies that buy from vendors in your home country. The hiring manager will let you know if their company does this. And if they don’t, I guess the interview is over.
Well, seriously, you might get asked brainteaser questions like these, especially in quantitative jobs. But remember that the interviewer doesn’t necessarily want an exact number—he wants to make sure that you understand what’s being asked of you, and that you can set into motion a systematic and logical way to respond. So, just take a deep breath, and start thinking through the math. (Yes, it’s OK to ask for a pen and paper!)