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_29871617_1 (name VARCHAR, property VARCHAR)
  ### Question:
  Which chromosomes have an unknown property?
  ### Answer:
  SELECT name FROM table_29871617_1 WHERE property = "Unknown"