Chitliv I suggest you to not to worry about opting any branch right now because it totally depends on your interest. Your graduation stream doesn't matter at all for the branch you want to opt while pursuing MBA degree.
In most of the top reputed colleges like IIMs and other private colleges in the first year, you are taught subjects from all the streams. This will give you enough time to figure out in which stream you are more comfortable and in which stream you actually want to make your own career.
Then in the second year, you are given the option to choose two streams one as Major and other as minor so that you will be studying all the subjects related to that stream only. Although in IIMs where there is General Management degree; there is no major-minor so you are allowed to choose all the subjects for the second year from any streams. At that time you can take more subjects from the stream which you like. Say if you like Marketing and Operations then you can pick most of the subjects from these streams to study in the second year.
As I said you don't need to worry and don't need to take a decision regarding without studying any stream but still as you have asked this question so I will suggest you can pick one of your streams as Analytics/operations. This could be a minor stream. The reason why I am suggesting this because being a non-engineer you haven't studied how to approach any problem analytically so this stream will help you in diversifying your knowledge. And believe me, no matter whatever stream you pick, whatever job you get this will be really helpful. It will also be helpful in ending up with a good job. Rest you can choose according to your interest.
All the best!!
You can preferrably go for MBA in economics or MBA in Media or MBA in HR.Few of the other options are MBA in International Economics & Finance, MBA in Managerial Finance,MBA in Finance,MBA in corporate and MBA in Marketing.I think you have a lot of options to choose from.
Read more: http://mbadiscussions.com/stream-choose-mba-after-b-economics-10411.html#ixzz54dNavT9E
Hope this helps
Best of luck