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55989 Medicine

40 year old lady presented with sudden onset of breathing difficulty. Clinical examination was essentially normal except for tachycardia and tachypnea. She gives history of two episodes of lower limb pain and swelling, first episode was 15 years back during her first pregnancy and second episode 3 months back. What would be the hematological abnormality respoinsible for her condition:

AProtein C excess
BResistance to activated protein C
CAntithrombin mutation causing accelerated effect
DPolycythemia vera
Medicine
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