This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
[{'content': 'The hot-cold phenomenon is seen due to which toxin- \nSelect and explain. \nA. Alpha lysin, B. Beta lysin, C. Gamma lysin, D. Theta lysin', 'role': 'user'}, {'content': "Answer: B \nExplanation: Beta hemolysin: is a sphingomyelinase hemolytic for sheep Blood cells but not for human or rabbit blood cells . It exhibits hot cold phenomenon the hemolysis being at 37degC but becoming evident only after chilling Ref: Ananthanarayan & paniker's Textbook of Microbiology 9th edition pg no 202", 'role': 'assistant'}]