With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Nepal hosts the annual meetings of a geopolitical union of nations.
text_B: A medical calculator is a type of medical computer software , whose purpose is to allow easy calculation of various scores and indices , presenting the user with a friendly interface that hides the complexity of the formulas .. computer software. computer software. Most offer further helpful information such as result interpretation guides and medical literature references .. Generally , such calculators are intended for use by health care professionals , and use by the general public is discouraged .. Medical calculators arose because modern medicine makes frequent use of scores and indices that put physicians ' memory and calculation skills to the test .. medicine. medicine. The advent of personal computers , the Internet and Web , and more recently personal digital assistants -LRB- PDAs -RRB- have formed an environment conducive to their development , spread and use .
not_related.