query: what type of government does the us follow?
answers: [ ' P r e s i d e n t i a l s y s t e m ' , ' F e d e r a l r e p u b l i c ' , ' R e p r e s e n t a t i v e d e m o c r a c y ' , ' T w o - p a r t y s y s t e m ' , ' C o n s t i t u t i o n a l r e p u b l i c ' , ' R e p u b l i c ' ]