This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'NOT a feature of ventilator associated pneumonia \nSelect and explain. \nA. Fever, B. Tachycardia, C. New shadows on chest X-ray, D. Leucocytosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (B) Tachycardia> Tachycardia: Clinical criteria for diagnosis of ventilator pneumonia include (fever, Leucotyosis, New changing radiographic infiltrates, development of purulent secretions change in oxygen requirement/ventilator settings, which have high sensitivity but low specificity.', 'role': 'assistant'}]