 How are citizens organized into different classes in society?
If I don't want to follow my aptitudes, the only choice is common labor. With its population legally fixed at three hundred million, most of the country had become one big suburb, dotted with community centers and lined with narrow belts of industrial development. If allowed to reach age-set or adulthood, such a deviant could be dangerous to its owner or to others. The cages were inside a sprawling concrete barn, which was divided into three large rooms—one for the fragile neuter humanoid creatures, and another for the lesser mutants, such as cat-Qs, dog-Fs, dwarf bears, and foot-high lambs that never matured into sheep. Age-sets were available from one to ten years human equivalent.
 By an analysis of their genes and heredity
 Through random assignment at birth  According to their socioeconomic status  After a lengthy interview with Anthropos upon reaching a specific age-set  By an analysis of their genes and heredity