Which description made by the client about allopurinol would reassure the nurse that teaching for this medication was successful?

a) "This medication will help dissolve the sodium uric acid calculi."
b) "I will take allopurinol as needed for pain relief."
c) "Allopurinol helps prevent the formation of uric acid crystals."
d) "I can stop taking allopurinol once the pain is gone."