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
[{'content': 'All of the following are acquired causes of hypercoagulability, except: \nSelect and explain. \nA. Infection, B. Inflammatory Bowel disease, C. Myeloproliferative disorders, D. Prolonged surgery > 1 hour', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Infection is not an acquired cause of hypercoagulability. Hypercoagulability represents an exaggerated form that predisposes to thrombosis and blood vessel occlusion. Acquired causes of hypercoagulability includes: ? Cancer ? Immobility ? Lupus anticoagulant ? Nephrotic syndrome ? Estrogens, pregnancy ? Anticardiolipin antibodies ? Congestive hea failure ? Heparin-induced thrombocytopenia ? Paroxysmal nocturnal hemoglobinuria ? Disseminated intravascular coagulation ? Inflammatory disorders, eg, ulcerative colitis ? Myeloproliferative disorder, eg, polycythemia vera, essential thrombocytosis Ref: Harrison Internal Medicine, 18th Edition, Chapter 262', 'role': 'assistant'}]