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': 'You started a patient on oral warfarin. Which of the following factors show the most rapid decline in the blood levels after the initiation of warfarin therapy? \nSelect and explain. \nA. Factor VII, B. Protein C, C. Factor X, D. Prothrombin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Protein\xa0C,\xa0protein\xa0S\xa0(both\xa0having anticoagulant\xa0property) and\xa0osteocalcin\xa0contain\xa0glutamate\xa0residues\xa0that\xa0require Vit.\xa0K dependent\xa0γ\xa0carboxylation.\xa0These are\xa0also\xa0inhibited by\xa0oral\xa0anticoagulants,\xa0but\xa0density\xa0of\xa0adult\xa0bone\xa0is\xa0not affected,\xa0though\xa0new\xa0bone\xa0formation\xa0may\xa0be\xa0depressed.\nReference: Essentials of Medical Pharmacology Seventh Edition KD\xa0TRIPATHI\xa0 page no 621', 'role': 'assistant'}]