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 child after consuming food in a party complains of diarrhea within 1-5 hours. The diagnosis is - \nSelect and explain. \nA. S. aureus, B. Streptococcus, C. Clostridium perfringens, D. Clostridium botulinum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Staphylococcal food poisoning occurs within 2-6 hrs after consuming contaminated food containing the preformed toxin.\nThe only other cause of food poisoning presenting within 4-6 hrs is Bacillus cereus.', 'role': 'assistant'}]