Having the correct answer was never a condition. You're supposed to have a question whenever you offer an answer. =]
To clarify, Pippin had a small, non-consumable item which he carried on his person, and lent to Gimli for the dwarf's use at Isengard (and, presumably, after). It was a spare.
What was it?
In that case...
What were Mary and Pip up to when they joined the fellowship and who were they doing it to.