Buddha Nullah has been the main source of Pollution of which among the following rivers ?

Q. Buddha Nullah has been the main source of Pollution of which among the following rivers ?
Answer: Sutlej
Notes: Budha Nullah is a seasonal water stream in the Malwa region of Punjab. It get polluted after entering the industrial area of Ludhiana city and finally drains into Sutlej River (tributary of the Indus river). It is a major source of pollution of Sutlej river.