The Nurse Is Assessing the Oral Cavity of a Client

The nurse is assessing the oral cavity of a client and notes a blackish, furry-looking coating on the tongue. Which question to the client is most appropriate based on this initial data?

A) "Have you eaten licorice lately?"
B) "How often do you brush your tongue?"
C) "Have you recently taken antibiotics?"
D) "Have you ever had this happen before?"