This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'nosocamial infection after how many hours ? \nSelect and explain. \nA. 48hrs, B. 72hrs, C. 7 days, D. 1 day', 'role': 'user'}, {'content': 'Answer: A \nExplanation: *Any infection causing illness that was not present or in its incubation period when the subject entered hospital or received treatment in outpatient clinic. *Infections are considered Nosocomial if they first appear 48 hours or more after hospital admission or within 30 days after discharge. *"Nosocomial" comes from two Greek words- "nosus" meaning "disease"+"komeion" meaning "to take care of"----disease contracted by a patient while under medical care. ref : harrisons 21st ed', 'role': 'assistant'}]