<prompt> Chest X-ray shows opacity after blunt trauma, most likely diagnosis isHaemothoraxPneumothoraxPneumoniaPulmonary embolism  <response>: Amongst the given options hemothorax and pneumonia consolidation produce opacity on chest X-ray. Pneumonia has nothing to do with blunt chest trauma, while hemothorax is common after blunt chest trauma. Therefore, best answer here is hemothorax.Pneumothorax causes hypertranslucency not opacity. 