Question: The 2009 Coca-Cola 600 was the which number stock car race, of the 2009 NASCAR Sprint Cup Series and the fiftieth iteration of the event, Stock car racing is a form of automobile racing found mainly and most prominently in the United States and Canada, with Australia, New Zealand and Brazil also having forms?
Sentence (from "Stock car racing"): Stock car racing is a form of automobile racing found mainly and most prominently in the United States and Canada, with Australia, New Zealand and Brazil also having forms of stock car auto racing.
Relevant evidence: Yes