For the civil services examination, UPSC provides a list of optional subjects. Candidates have to choose one optional for the mains exam.
Sociology is the study of society, social behavior, and the interactions among individuals within social systems.
Anthropology is the study of humanity, encompassing the biological, cultural, linguistic, and social aspects of human existence across time and space.
(PSIR) is the study of power, governance, political systems, and interactions between states, as well as non-state actors, in the international arena.