With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Demi Lovato is an advocate for Coke brand products.
text_B: Raymond -LRB- Ray -RRB- Thorsteinsson , -LRB- January 21 , 1921 -- April 23 , 2012 -RRB- was an award-winning Canadian geologist who focused on the geology of the high Arctic .. Canadian. Canadian. geologist. Geology. Arctic. Arctic. He was a Fellow of The Arctic Institute of North America , primarily known for his contribution to the geology of the Proterozoic and Paleozoic rocks .. Arctic. Arctic. Proterozoic. Proterozoic. Paleozoic. Paleozoic
not_related.