The best optional subject for the UPSC (Union Public Service Commission) exam in India depends on several factors, including an individual’s academic background, interests, and strengths. Here are some popular optional subjects for the UPSC Civil Services Examination:

  1. Public Administration
  2. History
  3. Sociology
  4. Political Science and International Relations
  5. Economics
  6. Geography
  7. Philosophy
  8. Psychology
  9. Sanskrit
  10. Law

It’s important to note that success in the UPSC exam depends not only on the choice of optional subject, but also on diligent preparation, a strong understanding of current affairs, and a strategic approach to the exam. Ultimately, the best optional subject is one that the individual has a genuine interest in and can perform well in.