This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
[{'content': 'What is the acceptable limit of bacterial count in an OT for neurosurgery? \nSelect and explain. \nA. 50 per cubic feet, B. 1 per cubic feet, C. 10 per cubic feet, D. 5 per cubic feet', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bacterial exam of air is done by Various methods and upper limits in surgical theatres are 10 per cubic feet and 1 per cubic feet in surgical OT for neurosurgery Ref: Textbook of Microbiology Baveja 5th ed Pg 636', 'role': 'assistant'}]