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Look at http://officialmbaguide.org. There is no specialization in legitimate MBA programs. Universities don't grant MBA in information systems, or MBA in finance, or MBA in marketing. MBA means Master in Business Administration. The MBA is a general degree preparing students for management positions in any level of a business, up to CEO. MBA students study accounting, finance, marketing, management, statistics, economics, strategy, policy, and other courses. Many MBA programs offer concentrations in these and many other fields, but that amounts to only 2-3 courses in your chosen field in the second year of study. Many students avoid a concentration and take a variety of elective subjects to gain a broader background. By the time you finish the first year you'll be able to decide which concentration interests you. You don't become a specialist in a field with 2-3 courses. It generally takes a year of concentrated study.
The MBA is not like an MS degree that concentrates study in a single field and prepares students for high level staff or research positions. The MS typically requires an undergraduate education in the field in which you want the MS, or a closely related field. A finance major does not get an MS in chemistry, and a biology major does not get an MS in accounting. If you want to specialize in a particular field other than business administration, such as finance, marketing, operations management, human resource management, or a non-business field such as public health, or public administration, you should get an MS degree in that specialization.
MBA programs accept students in any undergraduate field. They prefer students who do not have a business background because they give you the business training but they cannot provide the broad background that managers should have. I have taught MBA students with degrees in Music, Medicine, Dentistry, Law, Psychology, Political Science, Chemistry, Biology, Engineering, and many other fields. Most MBA programs prefer students with 2-3 years work experience after the first degree, but many accept students right out of college if they have good grades and a high GMAT score. Some MBA programs are designed specifically for new college graduates without work experience. MBAs with good grades are in high demand and they command good starting salaries.
The Official MBA Guide provides a lot of information about the MBA degree and MBA schools and programs. It's a comprehensive free public service with more th