<prompt> Most common cause of bleeding for massive hemothorax in blunt trauma to chest is fromIntercostal vesselsBronchial vesselsPulmonary vesselsInternal mammary aery  <response>: Answer- A. Intercostal vesselsThe most common cause of massive haemothorax in blunt injury to chest is continuing bleeding from torn intercostal vexels or occasionallyfrom the internal mammary aety. 