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': 'All are true about bilateral diaphragmatic paralysis,Except- \nSelect and explain. \nA. Sniff test is positive, B. Causes normocapnic failure, C. Diaphragmatic pacing is useful if any nerve is intact, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]