With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: On Saturday , China 's official news agency quoted Professor Mu Guangzhong , of the Beijing University population research institute , as saying by the year 2020 , 25 million men will fail to have wives if the current gender imbalance continues .
text_B: 2020 is a calendar year
entailed.