Candidates can choose from a variety of languages for the medium of the UPSC exam. The options typically include English and Hindi, along with regional languages such as Bengali, Telugu, Tamil, Marathi, and more. This flexibility allows aspirants to choose their preferred language for both the Prelims and Mains examinations, ensuring they can express themselves comfortably. This choice helps in reducing language barriers, making it easier for candidates to convey their understanding and knowledge effectively during the examination process.