The most common source of pulmonary embolism is:
Answer is C (Large veins of leg): About half the patients with pelvic vein thrombosis or proximal leg deep vein thrombosis have pulmonary thromboembolism. Isolated calf vein thrombosis pose a lower risk of pulmonary embolism- Harrisons
Amniotic fluid embolism
Calf vein thrombi
Large veins of leg
Cardio thoracic surgery