The best question (Erotetic logic)

Suppose we get a chance to ask an angel a question of our choice. What shou ld we ask to make the most of our unique opportunity? Ned Markosian has sho wn that the task is trickier than it might seem. Ted Sider has suggested pl aying safe and asking: What is the true proposition (or one of the true pro positions) that would be most beneficial for us to be told? Let's see wheth er we can do any better than that.