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: Medicine
[{'content': 'Which of the following statements about pneumothorax is true: \nSelect and explain. \nA. Breath sounds are increased, B. Percussion note is decreased, C. Always needs chest tube inseion, D. Often needs chest tube inseion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is D (Often need chest tube inseion): Pneumothorax is associated with decreased breath sounds, hyperresonant (increased) percussion note. Chest tube drainage is often required but is not necessary in all cases. Many small pneumothoraces resolve spontaneously as air is reabsorbed from the pleural space. In reliable patients with small stable pneumothorax observation alone may be appropriate', 'role': 'assistant'}]