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': '"Fecal" leucocytes are absent in all of the following, except: \nSelect and explain. \nA. Giardiasis, B. Cryptosporidiosis, C. Campylobacter infection, D. Clostridium perfringes infection', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Campylobacter infection', 'role': 'assistant'}]