With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Michelle Obama is the first First Lady of color.
text_B: The Austin F. Williams Carriagehouse and House is a historic house at 127 Main Street in Farmington , Connecticut .. Built in the mid-19th century , the property was designated a National Historic Landmark for the role it played in the celebrated case of the Amistad Africans , and as a `` station '' on the Underground Railroad .. National Historic Landmark. National Historic Landmark. Amistad. La Amistad. Underground Railroad. Underground Railroad
not_related.