With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: San Francisco's Chinatown is the oldest Chinatown in North America and the largest Chinese enclave outside Asia.
text_B: Lophar miocaenus is an extinct bony fish almost identical in form to the living bluefish , Pomatomus saltatrix , differing in its dentition , which consisted of `` thick , conical subequal teeth '' instead of the sharp , slender teeth and canines seen in bluefish .. bony fish. bony fish. bluefish. bluefish. L. miocaenus lived during the Upper Miocene subepoch of Southern California .. Upper Miocene. Upper Miocene. Southern California. Southern California
not_related.