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': 'Which of the following is a neutralisation test? \nSelect and explain. \nA. Kahn test, B. ASLO, C. Haemagglutin test, D. Amegakaryocytic thrombocytopenia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: a serum-precipitation reaction for the diagnosis of syphilis. Ref: Ananthanarayana & panikers 9th edition', 'role': 'assistant'}]