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
Inherited coagulation disorders are 
Select and explain. 
A. Protein C deficiency, B. Protein S deficiency, C. Leiden factor mutation, D. Lupus anticoagulant
A: Protein C deficiency
Answer: A: Protein C deficiency 
Explanation: 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)