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_67 (controller VARCHAR, nand_type VARCHAR, seq_read_write_mb_s VARCHAR)
  ### Question:
  Which controller is NAND type 25nm mlc-het with sequential read/write MB/s of 270/210?
  ### Answer:
  SELECT controller FROM table_name_67 WHERE nand_type = "25nm mlc-het" AND seq_read_write_mb_s = "270/210"