Which among the following is not a principal tributary of Brahmaputra?

Which among the following is not a principal tributary of Brahmaputra?
[A]Subansiri
[B]Dhansiri
[C]Sonai
[D]Manas

Sonai
The principal tributaries of Brahmaputra are the Subansiri, Jia Bhareli, Dhansiri, Puthimari, Pagladiya and the Manas.

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