<prompt> A 2-year-old child develops acute respiratory distress. 0E breath sounds are decreased with wheeze on right side. Chest X-ray shows diffuse opacity on right side--Most probable diagnosis:PneumothoraxForeign body aspirationPleural effusionUL emphysema  <response>: Foreign body aspiration is a very common problem in pediatric age group 4 years. In the question, child is presenting with sudden onset respiratory distress and there is UL decreased breath sounds UL wheezing and on chest X-ray a diffuse opacity is seen on right side i.e. there is clinical and radiological evidence of bronchospasm and collapse suggestive of a foreign body in bronchus 