With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Lung cancer is an illness.
text_B: Dragonsinger is a young adult science fiction novel by the American-Irish author Anne McCaffrey .. Anne McCaffrey. Anne McCaffrey. young adult. young adult fiction. science fiction. science fiction. Published by Atheneum Books in 1977 , it was the fourth to appear in the Dragonriders of Pern series written by Anne McCaffrey and her son Todd McCaffrey .. Anne McCaffrey. Anne McCaffrey. Dragonriders of Pern. Dragonriders of Pern. Atheneum Books. Atheneum Books. Todd McCaffrey. Todd McCaffrey. As the sequel to Dragonsong , it was the second book in the Harper Hall of Pern trilogy , with a new publisher , editor , and target audience -LRB- young adults -RRB- .. Dragonsong. Dragonsong. The original Dragonriders of Pern trilogy was completed after publication of the first two Harper Hall books .. Dragonriders of Pern. Dragonriders of Pern
not_related.