Option A? Seriously? Wearing surgical masks before entering is just common sense. I'm surprised they even included that as an option. What is this, a test for kindergarteners?
I'm torn between B and C, but I think C is the safer bet. After all, you don't want those pesky germs escaping, do you? Negative pressure is the way to go, my friends!
Option C seems like the correct answer here. Maintaining negative pressure in the isolation room is crucial to prevent the spread of airborne diseases.
Floyd
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