With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: The leaching of highly water soluble tannins from decaying vegetation and leaves along a stream may produce what is known as a blackwater river. Water flowing out of bogs has a characteristic brown color from dissolved peat tannins. Tannins, also known as humic acid, can be found in well water, yet despite giving it a bitter taste and bad smell, they do not raise any safety concerns.
text_B: Would it be advisable, for health reasons, for a utility to use a dog's sensitive nose to try to detect even a faint odor in drinking water before allowing it to be delivered to houses?
NO.