Question

an invisible force to which the azande address questions, and whose responses they believe to be truthful is called a(n)
oracle
chief
magician
witch

Explanation:

In Azande culture, an oracle is considered an invisible force to which they address questions and believe its responses are truthful. A chief is a leader, a magician is someone who practices magic, and a witch is believed to have harmful supernatural powers. None of these fit the description of an entity that answers questions truthfully like an oracle does.

Answer:

oracle