With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Dean Martin was an Italian-American singer.
text_B: Sheridan Downtown Commercial Historic District is a national historic district located at Sheridan , Hamilton County , Indiana .. historic district. Historic district ( United States ). Sheridan. Sheridan, Indiana. It encompasses 38 contributing buildings and 1 contributing structure in the central business district of Sheridan .. Sheridan. Sheridan, Indiana. central business district. central business district. It developed between about 1880 and 1939 , and includes notable examples of Italianate and Romanesque Revival style architecture .. Italianate. Italianate architecture. Romanesque Revival. Romanesque Revival architecture. Notable buildings include the H.J. Thistlethwaite Building -LRB- 1886 -RRB- , Carnegie library , First Christian Church -LRB- 1910-1911 -RRB- , Higbee Buggy Company , American State Bank -LRB- 1914 -RRB- , Stanley Brothers Building -LRB- c. 1895 -RRB- , Slliot 's Drugstore -LRB- c. 1913 -RRB- , Indiana Telephone Company building -LRB- c. 1910 -RRB- , and U.S. Post Office -LRB- 1939-1940 -RRB- .. It was listed on the National Register of Historic Places in 2007 .. National Register of Historic Places. National Register of Historic Places
not_related.