GENERAL KNOWLEDGE

Detailed explanation-1: -The correct answer is Rigveda. Gotra (Kinship unit or Clan) word first time came at the time of Rigveda.

Detailed explanation-2: -The institution of gotra appeared in the later Vedic age. Literally, it means the “cow pen” or the place where cattle belonging to the whole clan is kept, but over time, it signified descent from a common ancestor.

Detailed explanation-3: -The philological and linguistic evidence indicates that the Rig Veda is one of the oldest existing texts in any Indo-European language and that probably originated from the region of present day Pakistan, between 1500 and 1200 BCE.