Q: 41 (IAS/1996)

In the context of ancient Indian society, which one of the following terms does not belong to the category of the other three ?
question_subject: 
History
question_year: 
1996
question_exam: 
IAS
question_sub_subject: 
Ancient History
question_topic: 
Vedic Age
stats: 
0,11368,3120,560,1432,11368,1128