<prompt> All the following disorders are inherited except:Protein S deficiencyAntiphospholipid antibody syndromeProtein C deficiencyFactor V Leiden mutation  <response>: Ans: B Anti phospholipid antibody syndrome Ref: Robbins Pathologic Basis of Disease, 8th edition, Harrisons Online Chapter 117. Arterial and Venous Thrombosis Explanation:Heritable Causes of Arterial and Venous ThrombosisArterial ThrombosisPlatelet ReceptorsIntegrinsP1A2 polymorphismGPIVGPIbThrombin receptorRedox EnzymesPlasma glutathione peroxidaseEndothelial nitric oxide synthaseParaoxonaseHomocysteineCystathionine -synthase5.10-methylene tetrahydrofolate reductase MTHFR Venous ThrombosisProcoagulant Proteins FibrinogenProthrombinProtein C Anticoagulant PathwayFactor V LeidenThrombomodulinFibrinolytic Proteins with Known PolymorphismsTissue plasminogen activator tPaPlasminogen activator inhibitor PAI-1HomocysteineCystathionine-synthase5,10-methylene tetrahydrofolate reductase MTHFRAcquired Causes of Venous ThrombosisSurgeryNeurosurgeryMajor abdominal surgeryMalignancyAntiphospholipid syndromeOtherTraumaPregnancyLong-haul travelObesityOral contraceptiveshormone replacementMyeloproliferative disordersPolycythemia vera 