This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'In a warfarin treated patient skin necrosis is found in : a) Protein C deficiency b) Protein S deficiency c) AT III deficiency d) Factor VII deficiency e) Factor X deficiency \nSelect and explain. \nA. bd, B. ad, C. ab, D. ac', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]