Which substance is NOT considered to be Oil under the pollution prevention regulations? （）<br>A:Petroleum and fuel oil<br>B:Sludge<br>C:Oil mixed with dredge spoil<br>D:Oil refuse and oil mixed with wastes

Which substance is NOT considered to be Oil under the pollution prevention regulations? （）
A:Petroleum and fuel oil
B:Sludge
C:Oil mixed with dredge spoil
D:Oil refuse and oil mixed with wastes

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