With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Heroin is an amphetamine.
text_B: The Fort Selkirk volcanic field is a monogenetic volcanic field in the Northern Cordilleran Volcanic Province , Yukon Territory , Canada .. monogenetic volcanic field. monogenetic volcanic field. Northern Cordilleran Volcanic Province. Northern Cordilleran Volcanic Province. Yukon Territory. Yukon. Canada. Canada. Yukon. Yukon River. It is the northernmost Holocene age volcanic field in Canada , located close to the connection of the Yukon and Pelly rivers .. Holocene. Holocene. Canada. Canada. Yukon. Yukon River. Pelly. Pelly River. The youngest eruptions within the field are unknown .. However , the youngest volcano Volcano Mountain produced lava flows that appear to be only a few hundred years old .. Volcano Mountain. Volcano Mountain
not_related.