What is the name of the speaker if the chief minister is M.G. Ramachandran?
CREATE TABLE table_23512864_4 (
    speaker VARCHAR,
    chief_minister VARCHAR
)
SELECT speaker FROM table_23512864_4 WHERE chief_minister = "M.G. Ramachandran"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the name of the speaker if the chief minister is M.G. Ramachandran? ### Input: CREATE TABLE table_23512864_4 (
    speaker VARCHAR,
    chief_minister VARCHAR
) ### Response: SELECT speaker FROM table_23512864_4 WHERE chief_minister = "M.G. Ramachandran"