With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Nepal has forested hills.
text_B: MRC-5 -LRB- Medical Research Council cell strain 5 -RRB- is a diploid human cell culture line composed of fibroblasts derived from lung tissue of an 14 week old aborted caucasian male fetus .. Medical Research Council. Medical Research Council ( United Kingdom ). cell culture. cell culture. The cell line was isolated by J.P. Jacobs and colleagues in September 1966 .
not_related.