Final answer:
The nurse should ask the client for a copy of their advance directive before the transplant surgery.
Step-by-step explanation:
The most appropriate response by the nurse is: "You need to give us a copy before you have the transplant surgery."
When a client is admitted to the hospital for an organ transplant, having a copy of their advance directive is crucial. The advance directive contains the client's wishes and preferences regarding their medical treatment in case they become incapacitated or unable to express themselves. By providing a copy of the advance directive, the medical staff can ensure that the client's wishes are respected during their surgery and post-operative care.