With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Metro Boomin is an American.
text_B: Cryptogenic refers to something of obscure or unknown origin .. It is commonly used to refer to  :. Cryptogenic disease. Cryptogenic disease. Cryptogenic disease. Cryptogenic species. Cryptogenic species. Cryptogenic species. de  : Kryptogen
not_related.