With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: The exact composition of the slag heaps is unknown but a land study showed it to contain various poisonous elements such as Arsenic, Lead and Cadmium.
text_B: a land study showed it to contain various poisonous elements such as Arsenic, Lead and Cadmium.
entailment.