Question: How many prospective mixed martial arts fighters are secluded in a house during the filming of a television series in which Nate Diaz won the fifth season of?
Sentence (from "The Ultimate Fighter 5"): As with the show's usual format, sixteen prospective mixed martial arts fighters were secluded in a house near Las Vegas, Nevada and trained together while participating in a single-elimination tournament, with the winner being awarded a six-figure UFC contract.
Relevant evidence: Yes