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 common source of Staphylococcus in the hospital is \nSelect and explain. \nA. IV fluids, B. Infected wounds, C. Hands of hospital personnel, D. Bed linen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Staphylococci are the primary parasites of human beings and animals, colonizing the skin, skin glands and mucous membranes. The most common source of infection in human patients and carriers, animals and inanimate objects being less important. Patients with superficial infections and respiratory infection disseminate large numbers of staphylococci into the environment. About 10-30 percent of healthy persons carry staphylococci in the nose and about 10 percent in the perineum and also on the hair. The vaginal carriage is about 5-10 percent.', 'role': 'assistant'}]