With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The exact mechanism of Huntington's disease is known.
text_B: Nursultan Kairatuly Belgibayev -LRB- Нұрсұлтан Қаиратұлы Белгібаев born August 3 , 1991 -RRB- is a Kazakhstani professional ice hockey forward currently playing for the Barys Astana in the Kontinental Hockey League -LRB- KHL -RRB- .. Barys Astana. Barys Astana. KHL. Kontinental Hockey League. ice hockey. ice hockey. forward. Forward ( ice hockey ). Kontinental Hockey League. Kontinental Hockey League
not_related.