original_query: Who was M. C. Rajah and what were his contributions as a social and political activist in Tamil Nadu?
query: Who was M. C. Rajah and what were his contributions as a social and political activist in Tamil Nadu?
answer: M. C. Rajah was a Madras councillor and Paraiyar leader who successfully advocated for the adoption of the term Adi-Dravidar in government records to replace the offensive term Paraiyar.