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: Medicine
Predisposing factor for aerial thrombosis: 
Select and explain. 
A. AT III deficiency, B. Protein S deficiency, C. Protein C deficiency, D. Homocystenemia
D: Homocystenemia
Answer: D: Homocystenemia 
Explanation: Answer is D (Homocystenemia) Homoeystenemia is associated with increased risk of aerial thrombosis. Deficiency of AT III, Protein C and Protein S predisposes to venous thrombosis and not aerial thrombosis. Abnormality Aerial Venous Factor V Leiden mutation -- + Prothrombin -- + Antithrombin III -- + Protein C -- + Protein S -- + Homorysteinemia + + Antiphospholipid syndrome + +