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 table_name_53 (unit VARCHAR, location VARCHAR, authors VARCHAR)
  ### Question:
  What unit is located in China and has Zhou Zhang as an author?
  ### Answer:
  SELECT unit FROM table_name_53 WHERE location = "china" AND authors = "zhou zhang"