This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pneumothorax, Subject name: Medicine
[{'content': 'Which parameter is the best to differentiate cardiac tamponade from tension pneumothorax? \nSelect and explain. \nA. Raised JVP, B. Breath sounds, C. Raised Hea rate, D. Not improving after initial fluid resuscitation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Option A - Raised JVP is seen in both. Option B - Absent breath sound in tension pneumothorax Option C - Raised hea rate is a non-specific finding. Option D - both are example of obstructive shock, so IV fluid will not work.', 'role': 'assistant'}]