Question: "Holiday Special" is the third episode in the twenty-first season of the American animated television series "South Park", the twenty-first season of the American animated sitcom, premiered on Comedy Central on which date?
Sentence (from "South Park (season 21)"): The twenty-first season of the American animated sitcom "South Park" premiered on Comedy Central on September 13, 2017, and will contain ten episodes.
Relevant evidence: Yes