Which city in Bihar is known as the 'City of Silk' due to its famous Tussar silk industry?

contributor to Bihar's craft economy. The wording of the question specifically requires the association represented by Bhagalpur. Option A (Patna) is incorrect because it does not match the specific person, district, place, institution, event or factual association asked in the question. Option B (Gaya) is incorrect because it does not match the specific person, district, place, institution, event or factual association asked in the question. Option D (Darbhanga) is incorrect because it does not match the specific person, district, place, institution, event or factual association asked in the question. Thus the correct option is supported by the relevant Bihar-related historical, geographical, cultural or administrative context, whereas every distractor fails the exact person–place–event relationship. Bhagalpur is known as the 'Silk City' or 'City of Silk' due to its thriving Tussar (Tasar) silk industry. Bhagalpur Tussar silk, also known as Bhagalpuri silk, is famous for its rich texture, natural golden sheen, and durability. This silk has received a Geographical Indication (GI) tag from the Government of India, recognizing its unique regional identity. The silk weaving tradition in Bhagalpur dates back several centuries and involves thousands of weaver families who depend on this craft for their livelihood. Bhagalpuri silk sarees and fabric are exported across India and internationally. Patna is the state capital and a major administrative and commercial city but is not known for silk production. Gaya is a religious city associated with Buddhist and Hindu pilgrimage, particularly Bodh Gaya, but does not have a prominent silk industry. Darbhanga is the cultural capital of the Mithila region, known for its Sanskrit scholarship and Madhubani painting connections, but it is not called the City of Silk. The Bhagalpur silk industry provides employment to over 200,000 people in the region and is a significant contributor to Bihar's craft economy.