The Nurse Is Providing Discharge Teaching for a Patient Who $\mathrm{K}$

The nurse is providing discharge teaching for a patient who developed a pulmonary embolism after total knee surgery. The patient has been converted from heparin to sodium warfarin (Coumadin) anticoagulant therapy. What should the nurse teach the client?

A) Coumadin will continue to break up the clot over a period of weeks
B) Coumadin must be taken concurrent with ASA to achieve anticoagulation.
C) Anticoagulant therapy usually lasts between 3 and 6 months.
D) He should take a vitamin supplement containing vitamin $\mathrm{K}$