CREATE TABLE table_23512864_4 (speaker VARCHAR2, chief_minister VARCHAR2)

What is the name of the speaker if the chief minister is M.G. Ramachandran?
SELECT speaker FROM table_23512864_4 WHERE chief_minister = "M.G. Ramachandran"
SELECT "speaker" FROM "table_23512864_4" WHERE "M.G. Ramachandran" = "chief_minister"