<prompt> Primary injury is -Due to flying debrisDue to blast windDue to shock waveDue to complication  <response>: Ans. is c i.e., Due to shock waveTypes of blast injurieso These are of following types1 Primary : It is due to shock wave which causes injury to hollow organs, e.g. ears, lungs, eyes, GIT etc.Secondary : These are due to flying debris missiles. Classical Marshalls triad i.e. bruises, abrasions and puncture laceration is diagnostic of explosive injury.Tertiary : It is due to blast wind, i.e. victm is thrown into air and strikes other objects leading to fracture, blunt trauma etc.Quaternary : Any complicating factor not in first three categories causes quaternary injury, e.g. anoxia, respiratory problems etc. 