Which Statement by a Patient Receiving Nitroglycerin Ointment Indicates the Need

Which statement by a patient receiving nitroglycerin ointment indicates the need for additional teaching by the nurse?

A) "I will remove the previous dose before I put on the new dose."
B) "I will reapply the dose every 4 hours around the clock."
C) "I must avoid rubbing my skin when I put on a new dose."
D) "I will put tape over the paper so that the dose stays in place."