After Assessing the Patient and Identifying the Need for Headache

After assessing the patient and identifying the need for headache relief,the nurse administers acetaminophen (Tylenol) for the patient's headache.What is the nurse's next priority action for this patient?

A) Eliminate Acute pain from the nursing care plan.
B) Direct the nursing assistant to ask if the patient's headache is relieved.
C) Reassess the patient's pain level in 30 minutes.
D) Revise the plan of care.