This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Inherited coagulation disorders are \nSelect and explain. \nA. Protein C deficiency, B. Protein S deficiency, C. Leiden factor mutation, D. Lupus anticoagulant', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Harrison 16/e p685 Primary (Genetic) Common (>1% of the Population) Factor V mutation (G1691A mutation; factor V Leiden) Prothrombin mutation (G20210A variant) 5,10-Methylene tetrahydrofolate reductase (homozygous C677T mutation) Increased levels of factor VIII, IX, or XI or fibrinogen Rare Antithrombin III deficiency Protein C deficiency Protein S deficiency Very Rare Fibrinolysis defects Homozygous homocystinuria (deficiency of cystathione b-synthetase)', 'role': 'assistant'}]