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_79 (quantity INTEGER, class_to_1928 VARCHAR)
  ### Question:
  What is the smallest quantity having a Class to 1928 of BDi-21?
  ### Answer:
  SELECT MIN(quantity) FROM table_name_79 WHERE class_to_1928 = "bdi-21"