Which metal would NOT be a good sacrificial anode to inhibit the corrosion of iron by cathodic protection?

Question

Quizplus · Accepted Answer

Pb (lead) would not be a good sacrificial anode for protecting iron because it is less reactive than iron, meaning it will not readily oxidize in preference to iron. Sacrificial anodes work by being more reactive (electropositive) than the metal they are protecting, thus corroding (oxidizing) first.

Which Metal Would NOT Be a Good Sacrificial Anode to Inhibit