With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Excessive body fat increases the risk of dementia.
text_B: Borgo San Siro is a comune -LRB- municipality -RRB- in the Province of Pavia in the Italian region Lombardy , located about 25 km southwest of Milan and about 12 km northwest of Pavia , in the western Lomellina .. Lombardy. Lombardy. Pavia. Pavia. comune. comune. Province of Pavia. Province of Pavia. Italian. Italy. Milan. Milan. Lomellina. Lomellina. Borgo San Siro borders the following municipalities  : Bereguardo , Gambolo , Garlasco , Tromello , Vigevano , Zerbolo .. Bereguardo. Bereguardo. Gambolo. Gambolo. Garlasco. Garlasco. Tromello. Tromello. Vigevano. Vigevano. Zerbolo. Zerbolo
not_related.