Common optional subjects chosen by UPSC aspirants reflect the diversity of candidate backgrounds and interests. Popular options include Public Administration, Sociology, Geography, and Political Science. These subjects are preferred due to their relevance to current affairs and their alignment with the general studies syllabus. Candidates often select subjects based on their strengths, prior knowledge, or interest in specific topics. Ultimately, choosing an optional subject plays a crucial role in augmenting overall performance in the mains examination, as it allows candidates to showcase in-depth understanding and analytical skills.