Find the code of city where most of students are living in.
CREATE TABLE student (
    city_code VARCHAR
)
SELECT city_code FROM student GROUP BY city_code ORDER BY COUNT(*) DESC LIMIT 1
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: Find the code of city where most of students are living in. ### Input: CREATE TABLE student (
    city_code VARCHAR
) ### Response: SELECT city_code FROM student GROUP BY city_code ORDER BY COUNT(*) DESC LIMIT 1