With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Greenland shark is also known as the grey shark.
text_B: Nikolay Apollonovich Beleloubski -LRB- March 13 , 1845 , Kharkiv -- August 4 , 1922 , Petrograd -RRB- was a leading bridge designer , civil engineer and scientist in Imperial Russia .. Kharkiv. Kharkiv. Petrograd. Petrograd. Imperial Russia. Imperial Russia
not_related.