With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Bangladesh is the largest part of the Bengal region.
text_B: Single deposit is one-time lump sum investment .. lump sum. lump sum. investment. investment. The Investment is made at the start of the period ; grows over the period and matures at the end of the period .. Examples of a single deposit are certificates of deposit or Fixed Deposits .. certificates of deposit. Certificate of deposit
not_related.