This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'For open pneumothorax which of the following is M/n of choice - \nSelect and explain. \nA. IPPV, B. ICD with underwater seal, C. Thoracostomy and close the rent, D. Wait and watch.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans is \'b\' ie ICD with under water seal "Open Pneumothorax is one in which full thickness segment of the chest wall has been destroyed and the negative intrapleural pressure sucks air directly through the chest wall defect rather than through the trachea into the alveoli . It occurs most commonly after shot gun blasts explosion with flying debris . The pt. is stabilized by any mechanical covering over the open wound. As soon as convenient a water tight dressing should be placed and an intercostal catheter inseed into the pleural cavity. Early debridement and formal closure of the wound should then be performed."', 'role': 'assistant'}]