With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Greenland shark is a type of shark.
text_B: The Greenland shark -LRB- Somniosus microcephalus -RRB- , also known as the gurry shark , or grey shark , or by the Inuit name eqalussuaq , is a large shark of the family Somniosidae -LRB- `` sleeper sharks '' -RRB- , closely related to the Pacific and southern sleeper sharks .. Somniosidae. Somniosidae. Somniosus. Somniosus. Inuit. Inuit languages. shark. shark. Pacific. Pacific sleeper shark. The distribution of this species is mostly restricted to the waters of the North Atlantic Ocean and Arctic Ocean .. distribution. Species distribution. Atlantic Ocean. Atlantic Ocean. Arctic Ocean. Arctic Ocean. It has the longest known lifespan of all vertebrate species -LRB- 392 ± 120 years -RRB- , and is among the largest extant species of shark .. shark. shark. vertebrate. vertebrate. As an adaptation to living at depth , it has a high concentration of trimethylamine N-oxide in its tissues , which causes the meat to be toxic .. trimethylamine N-oxide. trimethylamine N-oxide. Greenland shark flesh treated to reduce toxin levels is eaten in Iceland as a delicacy known as kæstur hakarl .. shark. shark. Iceland. Iceland. kæstur hakarl. Hakarl
related.