Explanation

The Dhaleswari is a tributary of the Barak river system in the Manipur-Assam region. The Subansiri, Dhansiri and Manas are all tributaries of the Brahmaputra, not the Barak. The Barak rises in Manipur and flows through the Cachar plains before entering Bangladesh as the Surma-Meghna. Hence Dhaleswari is the Barak tributary in the list.