With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Vladimir Putin studied insects at the Saint Petersburg State University.
text_B: Reason is the second album by English singer-songwriter , Melanie C .. Melanie C. Melanie C. It was the follow up album to Northern Star .. Northern Star. Northern Star ( Melanie C album ). Released on 10 March 2003 , it reached number five in the UK Albums Chart , selling 30,876 copies in its first week .. Although not performing as well as Northern Star , Reason has a Gold certification in the United Kingdom , with 101,889 copies sold .. Northern Star. Northern Star ( Melanie C album ). Gold certification. Gold certification. The album has sold 500,000 copies worldwide .. The album has been released with the Copy Control protection system in some regions .. Copy Control. Copy Control. Most reviews for the album were mixed to positive .
not_related.