<prompt> Most common cause of Thrombotic Pulmonary Embolism isprogesterone pillsDeep vein thrombosisSepticemiaIdiopathic  <response>: B Deep vein thrombosis DEEP VENOUS THROMBOSIS in the leg or in the pelvis is most likely the cause of pulmonary embolism, but in about 80-90, it occurs without any previous clinical manifestations. Pulmonary embolism: Following dislodgement of venous thrombi generally from femoral and iliac veins. Causes: Multiple trauma, tumor embolus, amniotic fluid. Sign and symptoms: Pleurisy, haemoptysis, crackles, shortness of breath. Sign and symptoms of right heat failure and raised CVP Diagnosis: Ventilation perfusion scan confirm the diagnosis. Contrast enhanced CT scan most accurate technique. Treatment: Thrombolytic agents streptokinase, TP factors. Pulmonary embolectomy may be required. Lung transplantations indicated in: End stage parenchymal or pulmonary vascular disease Cystic fibrosis and irreversible pulmonary hypertension with right ventricular failure. 