Answer: Patna
Notes: Patna is the most populous district in Bihar. The population is about 58 lakhs. The Patna district is a part of Patna division. As of 2011, It is the most populous district of Bihar (out of 38) and fifteenth most populous district of India (out of 640).
📌 Question Number: 14 in Demography, Tribes, Census and Society of Bihar in the above course in App.