query: which countries in africa were slaves taken from?
answers: [ ' A n g o l a ' , ' C h a d ' , ' A l g e r i a ' , ' C a p e V e r d e ' , ' B o t s w a n a ' , ' C e n t r a l A f r i c a n R e p u b l i c ' , ' B u r u n d i ' , ' C a m e r o o n ' , ' B u r k i n a F a s o ' , ' B e n i n ' ]