This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Anaesthesia
[{'content': 'PA view of chest X-ray is given here. What is the diagnosis? \nSelect and explain. \nA. Right Pneumothorax with right tracheal shift, B. Right Pneumothorax with left tracheal shift, C. Left Pneumothorax with left tracheal shift, D. Left Pneumothorax with right tracheal shift', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Given image is showing absent bronchioalveolar markings of right lung with tracheal shift towards left side which is suggestive of right pneumothorax. Pneumothorax: presence of air or gas in pleural cavity Also remember, Deep sulcus sign on supine chest X-ray in expiration phase is a feature of pneumothorax.', 'role': 'assistant'}]