With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Vitamin B-12 changes in water.
text_B: Johan Peter Falk -LRB- 26 November 1732 -- 31 March 1774 -RRB- was a Swedish botanist and an apostle of Carl Linnaeus .. Swedish. Sweden. botanist. botanist. apostle of Carl Linnaeus. Apostles of Linnaeus. Carl Linnaeus. Carl Linnaeus. His first name is sometimes spelled `` Johann '' ; his middle name is sometimes spelled `` Pehr '' ; and his last name is sometimes spelled `` Falck '' .. Falk was born in Broddetorp , Vastergotland .. Vastergotland. Vastergotland. He studied at the University of Uppsala under Carl Linnaeus .. University of Uppsala. University of Uppsala. Carl Linnaeus. Carl Linnaeus. Falk travelled to St Petersburg , and participated in the Russian expedition -LRB- 1768 -- 1774 -RRB- organised by the German scientist Peter Simon Pallas .. St Petersburg. St Petersburg. Peter Simon Pallas. Peter Simon Pallas. Falk took his own life in Kazan .. Kazan. Kazan. Falk 's notes were published in Germany as Beytrage zur topgraphischen Kentniss des russischen Reichs I.III -LRB- 1785 -- 1786 -RRB- .. Germany. Germany. They were edited by Johann Gottlieb Georgi .. Johann Gottlieb Georgi. Johann Gottlieb Georgi
not_related.