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_21538523_1 (caliber VARCHAR, type VARCHAR)
  ### Question:
  How many calibers require the type LB/RN?
  ### Answer:
  SELECT COUNT(caliber) FROM table_21538523_1 WHERE type = "LB/RN"