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_148578_1 (yield__approximate_ VARCHAR, explosion VARCHAR)
  ### Question:
  What was the yield of the K-4 explosion?
  ### Answer:
  SELECT yield__approximate_ FROM table_148578_1 WHERE explosion = "K-4"