What is the reason for you to leave the current job?

Not sure of how to answer this question? Keep in mind this isn't a period for a job searcher to bad mouth your boss or past employer. Doing as such will be a warning and make an issue that could hurt you as early on as during the telephone interview.

What this inquiry is genuinely getting at is the reason you are searching for another job at the place you're interviewing. So even though it's not expressed that way, react by discussing how engaging this particular opportunity is to you. As enticing as it might be to vent, don't spend any time harping on the things that make you sound miserable or unsatisfied at your present organization.