A Patient Diagnosed with Bursitis Asks the Nurse, "Why Do

A patient diagnosed with bursitis asks the nurse, "Why do you keep asking what my pain level is? Don't you believe me?" How should the nurse respond?

A) "It is important to know your pain level so that we can provide you with the best medication."
B) "If you don't want the medication, you don't have to take it."
C) "I can't give you the medication unless I know what your pain level is."
D) "I don't understand why you are concerned about my questions. Would you clarify?"