It doesn't give us the amount, so i'd say they're just looking for the process in generalities.
So I would add an appropriate amount of hydroxide to this solution, as well as to a control of just water and another control of just aqueous lead. Then I will look for any reactions that would happen. I assume the hydroxide will react with the lead to form a solid, so that's what I will look for, comparing it to the two controls. I would hope that there would be enough to be visible, but again i'm assuming that since they don't give much information with the question that they are assuming there won't be this sort of problem (hopefully).
But before I put any more thought into this, I just want to know if the hydroxide would react with the water as well?