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: Medicine
[{'content': 'Poisoning of food by which of the organisms has the shortest incubation period - \nSelect and explain. \nA. S. aureus, B. Salmonella, C. Botulism, D. Cl. perfringesn', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]