 The Mahabharata, whose final version is estimated to have been completed by the end of the fourth century, discusses the "varna" system in section 12.181, presenting two models.The first model describes "varna" as a colour-based system, through a character named Bhrigu, "Brahmins "varna" was white, Kshatriyas was red, Vaishyas was yellow, and the Shudras' black".This description is questioned by Bharadvaja who says that colors are seen among all the "varnas", that desire, anger, fear, greed, grief, anxiety, hunger and toil prevails over all human beings, that bile and blood flow from all human bodies, so what distinguishes the "varnas", he asks.