Conversation so far:
what is the poultry capital of the world
The poultry capital of the world is Gainesville, Georgia
Why is Gainesville, Georgia the poultry capital of the world
Gainesville, Georgia, is the poultry capital of the world because of its large number of poultry processing plants
Who is the mayor of Gainesville
The mayor of Gainesville, Georgia, is Danny Dunagan

Question: What's the population
Self-contained rewrite: What's the population of Gainesville