Final answer:
The nurse's best comment to the patient is to acknowledge their use of the herb and record it in their medical record. This response shows openness to complementary therapies.
Step-by-step explanation:
The nurse's best comment to the patient would be a. 'Thanks for telling me. I'll make a note in your medical record that you take it.' This response acknowledges the patient's use of the herb and ensures that the information is recorded for future reference. It also shows that the nurse is open to considering complementary therapies.