Teacher:In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Teacher: Now, understand the problem? Solve this instance: Context: The Indian epic, the Mahabharata; ancient religious texts, the Puranas; and the Edicts of Ashoka stone pillar inscriptions of the emperor Ashoka dating from the third century BCE all mention Tripura. Link Information: The Edicts of Ashoka are a collection of more than thirty inscriptions on the pillars, as well as boulders and cave walls, attributed to Emperor Ashoka of the Mauryan Empire who reigned from 268 BCE to 232 BCE. Question: Which is the oldest ancient religious text that mentions Tripura?
Student:
Answer: Puranas