With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: General Rodriguez said the bomber was believed to be a member of the Ansar al-Sunna terrorist group , which claimed responsibility for the December 21 attack - the deadliest on U.S. forces since the U.S.-led invasion in March , 2003 .
text_B: December is a month
entailed.