Question: The 1953 Auburn Tigers football team marked the 21st season as a member of an American college athletic conference that is headquartered in Birmingham Alabama, and has how many teams?
Sentence (from "Southeastern Conference"): The SEC participates in the National Collegiate Athletic Association (NCAA) Division I in sports competitions; for football, it is part of the Football Bowl Subdivision (FBS), formerly known as Division I-A.
Relevant evidence: No