With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Summertime (George Gershwin song) is an aria composed in Germany.
text_B: Mikhaylovsky District is an administrative and municipal district -LRB- raion -RRB- , one of the twenty in Amur Oblast , Russia .. Amur Oblast. Amur Oblast. raion. raion. twenty. administrative divisions of Amur Oblast. Russia. Russia. The area of the district is 3039 km2 .. Its administrative center is the rural locality -LRB- a selo -RRB- of Poyarkovo .. selo. village#Russia. Poyarkovo. Poyarkovo, Amur Oblast. administrative center. administrative center. rural locality. types of inhabited localities in Russia. Population  : 17,081 -LRB- 2002 Census -RRB- ; The population of Poyarkovo accounts for 46.8 % of the district 's total population .. Poyarkovo. Poyarkovo, Amur Oblast. 2002 Census. Russian Census ( 2002 )
not_related.