With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Young Fionn, still known by his boyhood name Demne, met the poet Finn Éces (Finnegas), near the river Boyne and studied under him. Finnegas had spent seven years trying to catch the salmon that lived in Fec's Pool () of the Boyne, for it was prophesied the poet would eat this salmon, and "nothing would remain unknown to him". The text never explicitly refers to this fish as being the "Salmon of Knowledge", but many readers presume that it is indeed the salmon ingested knowledge at Segais Eventually the poet caught it, and told the boy to cook it for him. While he was cooking it, Demne burned his thumb, and instinctively put his thumb in his mouth. This imbued him with the salmon's wisdom, and when Éces saw that he had gained wisdom, he gave the youngster the whole salmon to eat, and gave Demne the new name, Fionn.
text_B: From the way that he behaves in the story, is it likely that Éces had heard the prophesy of the salmon giving the poet wisdom, and therefore knew that only young Finnegas could benefit from eating the fish?
YES.