Which river is known for changing its course frequently in Bihar?
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This question examines an important Bihar General Knowledge fact: “Which river is known for changing its course frequently in Bihar?” The correct answer is Kosi. The Kosi River is notorious for changing its course and causing floods. Bihar GK covers the state’s history, geography, rivers, districts, wildlife, culture, administration, economy, institutions and notable personalities. A reliable solution begins by identifying whether the question asks for a place, person, date, title, institution or distinctive feature. The answer Kosi matches that requirement directly. Option A (Gandak) does not match the exact person, district, site, institution, event or association required by the question. Option C (Son) does not match the exact person, district, site, institution, event or association required by the question.