Why we should hire you:

 By asking this question interviewer wants to know how you are different from other candidates. Here you have to sell yourself. To answer this question try to tell them your unique abilities that are related to the job. For example, if the job timings are odd you can tell them that you are comfortable by working in an irrational shift or if the nature of the job gives you deadlines you can tell them that you can perform well under the pressure.(of course do not lie, this is just an example).