With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: There is little chance of heavy-metal poisoning occurring due to the ingestion of fish-oil supplements, because heavy metals such as mercury, lead, nickel, arsenic, and cadmium do not accumulate in the oil of the fish, and instead selectively bind to proteins in the animal's flesh.
text_B: Since heavy-metal toxicity is something that occurs slowly over a lifetime, in even the worst case scenario, could fish-oil supplements still be taken by the elderly without undue worry?
YES.