Which group of people were not imprisoned in concentration camps?
a. nazi party members
b. people from so-called "inferior" races
c. communist party members
d. people with disabilities or mental illness

The correct answer is: Nazi party members (although some could be: but they would typically be stripped of their membership first). The camps were organized by the Nazis: so they would not imprison themselves. 

The other groups were imprisoned in those camps. 

Different trial court