Final answer:
A client with a recent liver transplantation reporting fever and flank pain should be advised to contact the transplant team immediately due to the risk of infection or organ rejection.
Step-by-step explanation:
The best response to a client who has undergone liver transplantation 2 weeks ago and reports a temperature of 101 degrees F (38 degrees C) and right flank pain would be option C: "You may be rejecting the transplanted liver, and should call the transplant team immediately." This is because fever and pain may indicate an infection or possible organ rejection, which is a medical emergency following transplantation. Option A is true, but it does not address the urgent nature of the symptoms being reported. Option B is inappropriate without further assessment by a healthcare provider, and taking acetaminophen might mask symptoms without resolving the underlying cause. Option D is potentially harmful; altering doses of immunosuppressant drugs like cyclosporine without medical supervision could further complicate the client's condition.