Sindhi is considered one of the oldest regional languages of Pakistan, with its history dating back to the days of the Indus Valley Civilization. This is evident from references going back thousands of years, with the first references to the region and its language found in books such as ‘Nātyaśāstra’ (200 B.C.–200 A.D.).
Quick Info: Brahui has its roots in a very ancient era, as it is associated with the long-standing Dravidian lineage. But in most Pakistani examinations, the answer that comes up most often is Sindhi. And the reason for this is clear. Sindhi has the oldest written and literary tradition in the region. It came up locally in the Indus region.