How to answer a question that will be asked in interview?

Hello people my UG was B.C.A. and i was in search of job for a year and it was the time when recession stuck i dint find a suitable job so i decided to go for higher studies now i am pursuing MBA and my specialization are Finance and HR.If i am put up a question like why did i switch over from computers to business administration and i chose HR and Finance what answer should i give back so that it would be appealing to the person interviewing me