Detailed Instructions: Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.
Problem:original question: How many sports teams are there in [Mixed martial arts]?
answer: 4
answer type: Sports Team.
auxiliary information: Mixed martial arts is a full-contact combat sport that allows the use of both striking and grappling techniques, both standing and on the ground, from a variety of other combat sports and martial arts. Various mixed-style contests took place throughout Europe, Japan and the Pacific Rim during the early 1900s. In 1980 CV Productions, Inc. created the first regulated MMA league in the United States named Tough Guy Contest, later renamed Battle of the Superfighters, sanctioning ten tournaments in Pennsylvania. However, in 1983 the Pennsylvania State Senate passed a bill prohibiting the sport. The combat sport of vale tudo that had developed in Brazil from the 1920s was brought to the United States by the Gracie family in 1993 with the founding of the Ultimate Fighting Championship. The first documented use of the name mixed martial arts was in a review of UFC 1 by television critic Howard Rosenberg, in 1993. The term gained popularity when the website newfullcontact.com, then one of the largest covering the sport, hosted and reprinted the article. The question of who actually coined the term is subject to debate.
Solution:
How many [Mixed martial arts] tournaments have been held throughout the sport's history?