<prompt> Which one does not cause deep vein Thrombosis -OestrogenThrombocytosisParoxysmal nocturnal haemoglobinuriaSickle cell anemia  <response>: Sickle cell anemia does not cause DVT. They cause vaso-occlusive crisis by plugging the microcirculation aggregate of Sickle cell are formed in the capillaries because of hypoxia. 