Which of the following is/are tributary/tributaries of Brahmaputra? 1. Dibang 2. Kameng 3. Lohit Select the correct answer using the codes given below:

All three rivers drain into the Brahmaputra system in Arunachal Pradesh, so the answer is D.

• 1. Dibang: A major right-bank tributary rising in the high Mishmi hills. It carries glacier and rain melt down to the Brahmaputra plains near Sadiya, where it meets the Lohit to form the main Brahmaputra channel.
• 2. Kameng: A left-bank tributary draining the Kameng district of Arunachal. It flows south into the Brahmaputra plains, so it is a correct tributary.
• 3. Lohit: The eastern headwater stream that joins the Dibang near Sadiya. Its combined flow continues as the Brahmaputra, so it is a correct tributary.

The core concept is the drainage pattern of the Brahmaputra, which rises as the Tsangpo in Tibet, enters India as the Siang, and receives several rivers from the Himalayan and Purvanchal side. This matters for Mains on flood management and hydropower in the northeast.

Trap: Aspirants sometimes treat the Lohit as a separate river that doesn't join the Brahmaputra, or wrongly think Dibang and Lohit are not both tributaries. Remember that the Dibang-Lohit confluence near Sadiya is where the Brahmaputra is formed in the Indian plains.