<prompt> D_Dimer is the most sensitive diagnosis test forPulmonary embolismAcute pulmonary oedemaCardiac tamponadeAcute myocardial infraction  <response>: Ref Robbins 9e p127 D-Dimer ia a fibrin degradation product ,a small protein fragment present in blood after a blood clot is degraded by fibrinolysis,it is so named because it contains 2crosselinkedDFragments of fibrinogen protein 