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1. A 70-year-old man with a history of atrial fibrillation is started on an oral anticoagulant. His prothrombin time is monitored on a regular basis. A few months into his therapy, he begins treatment for a duodenal ulcer and he develops symptoms of a bleeding diathesis. Which of the following ulcer medications is most likely responsible for this change in his hemostatic status?
A.
B.
C.
D.
E.