When collecting data, the nurse understands which individual is the primary source of information regarding pain tolerance.

A. The patient is the primary source of information regarding their pain tolerance, as pain is subjective and only the patient can accurately describe their experience. B. A patient's roommate cannot reliably report on the patient's pain experience. C. The CNA may observe signs of pain but cannot determine the patient's subjective pain tolerance. D. The nurse can assess the patient's pain based on behaviors and reports but relies on the patient for direct information.