You can opt for MBA in IT.
Other fields you can choose are:

-Finance
-Human Resource Management
-System Management
-Marketing Management

I suggest you that if you do MBA in Systems management or in Information technology management will be more useful to you in your future as you are from technical background and have done B.tech in computer science.

So take wise decision, it depends on you whether to do MBA course after doing B.tech and to choose which stream if you join MBA course.

Good luck.