This is an important question for the manager. If you are hired on as a analyst and you have to do some data entry, you might not be happy about it. But if there it has to be done, then the manager has to assign the work to someone. They want to find out if you are the type of person who is willing to work on boring and tedious things. The long answer is the answer I gave when I was asked this question.
This answer is showing loyalty and being able to sacrifice personal interest for the success of the company. Maybe it was this question that helped me pass my third interview.