Name the founder of the Parmar Dynasty of Abu.

A dynasty's founder, as recorded in genealogical and epigraphic tradition, is the ruler credited with establishing a distinct ruling branch at a given seat of power; when a parent lineage splits into multiple branches, each branch's own founder is identified from the earliest ruler consistently named in that branch's chronicle and inscriptional record -- though for early medieval branches the exact starting figure can vary between traditional genealogy and later epigraphic reconstruction.

The Paramara (Parmar) dynasty split into three regional branches -- Malwa, Vagad, and Abu -- with the Abu branch based at Chandravati near Mount Abu. Rajasthan's standard history and general-knowledge references, and RSSB's own official answer key for this paper, credit Dhumraj as the ruler who founded this Abu branch.

• Dharavarsh -- a Paramara ruler of Abu attested in a later, 12th-13th century inscriptional record at the Patanarayan temple, Sirohi; he belongs to the same Abu branch but to a later generation than its founding.

• Pratap Singh -- the name most widely documented in Rajasthan history is the 16th-century Sisodia ruler of Mewar; no comparable documentation ties this name to the founding of the Abu Parmar branch.

• Dalail Singh -- documented among the later Hada Chauhan rulers of Bundi state, a separate Rajput lineage from the Paramaras of Abu.

As Rajasthan's standard references and RSSB's official key both credit Dhumraj with founding the Abu branch of the Paramara dynasty, Dhumraj is correct.