With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: Among those attending the summit of the 53-member African Union are United Nations Secretary-General Kofi Annan and Nigerian President Olusegan Obasanjo , who is the head of the AU .
text_B: Olusegan Obasanjo is a month
not-entailed.