With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: One of lung cancer's symptoms is breathing complications.
text_B: Dmitri Nikolaevich Sheremetev -LRB- Дмитрии Николаевич Шереметев 3 January 1803 in Saint Petersburg - 12 September 1871 in Kuskovo -RRB- was a Russian aristocratic , member of the Sheremetev family .. Saint Petersburg. Saint Petersburg. Kuskovo. Kuskovo. Sheremetev. Sheremetev. He was the only son of Nikolai Sheremetev and the father of Aleksandr Sheremetev .. Sheremetev. Sheremetev. Nikolai Sheremetev. Nikolai Sheremetev. Aleksandr Sheremetev. Aleksandr Sheremetev
not_related.