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: Surgery
[{'content': 'In a surgical patient, the causes of non surgical infection are all, except \nSelect and explain. \nA. Lower respiratory tract infection, B. Wound infection, C. Clostridium difficile diarrhea, D. UTI', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Surgical site infections (SSIs)\xa0 are the third most frequently reported nosocomial infection, first one being pneumonia and the second,\xa0 catheter-related\xa0 (including urinary\xa0 tract infection).\nSSI within 24 hours is caused by clostridia and streptococci.\nSSI\xa0 after 48\xa0 hours\xa0 (5\xa0 days)\xa0 is\xa0 caused\xa0 by\xa0 gram -ve\xa0 and other\xa0 bacteria.\nClostridium diﬃcile diarrhea occurrence is due to administration of various antibiotics.\n\n\u200bReference:\xa0 Manipal Manual of Surgery 4th ed page no 26, 28', 'role': 'assistant'}]