A client whose mania is related to a medical condition asks why the health care provider has prescribed carbamazepine instead of lithium. Which is the nurse's best response?

"I don't know. Make sure you discuss this with your health care provider as soon as you can."

"This drug is best for clients who do not respond to lithium or whose mania is related to a medical condition, as is yours."

"You will be fine taking this drug, so don't worry."

"This drug may be preferred by your health care provider for many reasons."