This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hematology, Subject name: Pharmacology
[{'content': 'Vascular dermal necrosis is seen with \nSelect and explain. \nA. Warfarin, B. Hirudin, C. Dabigatran, D. Rivaroxiban', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vascular dermal necrosis occurs due to warfarin Cutaneous necrosis with reduced activity of protein C sometimes occurs during the first weeks of therapy. Rarely, the same process causes frank infarction of the breast, fatty tissues, intestine, and extremitiesKatzung 12e pg: 610', 'role': 'assistant'}]