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: Microbiology
[{'content': 'A patient in ICU and on ventilator develops cough with fever. The gram-staining on microscopy will show: \nSelect and explain. \nA. Gram negative cocci, B. Gram negative bacilli, C. Gram positive bacilli, D. Gram variable organism', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is. 'b' i. e., Gram negative bacilli", 'role': 'assistant'}]