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': 'Toxin of emetic strain of bacillus cereus resembles in action of \nSelect and explain. \nA. Heat stable toxin of S.aureus, B. Heat labile toxin of E.coli, C. Cholera toxin, D. Pseudomonas toxin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is a preformed toxin similar to S.aureus enterotoxin.', 'role': 'assistant'}]