Unemployment: The lowest in Purnia and the highest in Patna.

Here is the translation of the given Hindi text into English, following the provided guidelines: 1. Maize Revolution: Purnia and the entire Seemanchal region have become major maize producing centers in India. 2. Gulabbagh Mandi: One of the largest maize markets in eastern India. Maize from here is traded on a large scale for poultry feed, cattle feed, starch industries, and ethanol production across the country. 3. Ethanol Industry: The country's first grain-based ethanol plant has been established in Parora, Purnia.