<prompt> Pulmonary embolism is most commonly produced by which of the followingTraumaAtherosclerosisThrombosis of pelvic vesselsNone  <response>: When venous thrombi are dislodged from their site of formation,they embolize to the pulmonary aerial circulation producing pulmonary embolism.About one-half of patients with pelvic vein thrombosis develop pulmonary embolism.Other causes of pulmonary embolism include hipknee surgery,trauma,pregnancy,immobility,thrombotic disorders. Reference:Harrisons medicine-18th edition,page no:2171;Davidsons medicine,22nd edition,page no:721. 