Which river is called the 'Sorrow of Bihar'?

Correct answer: (c) Kosi

Explanation

The Kosi is called the "Sorrow of Bihar". It rises in Nepal and Tibet, carries huge loads of silt from the Himalaya and floods north Bihar almost every year. It also shifts its course: it has moved more than 100 km westward in about two centuries. The Kosi barrage at Hanuman Nagar (Nepal) and the embankments along it were built to control it.

(The Damodar used to be called the "Sorrow of Bengal".)