text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE student (city_code VARCHAR)
  ### Question:
  Find the code of city where most of students are living in.
  ### Answer:
  SELECT city_code FROM student GROUP BY city_code ORDER BY COUNT(*) DESC LIMIT 1