With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The United States Army is an organization.
text_B: Hermann Heinrich Gossen -LRB- 7 September 1810 -- 13 February 1858 -RRB- was a Prussian economist who is often regarded as the first to elaborate a general theory of marginal utility .. marginal utility. marginal utility
not_related.