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
Which of the following is a neutralisation test? 
Select and explain. 
A. Kahn test, B. ASLO, C. Haemagglutin test, D. Amegakaryocytic thrombocytopenia
A: Kahn test
Answer: A: Kahn test 
Explanation: a serum-precipitation reaction for the diagnosis of syphilis. Ref: Ananthanarayana & panikers 9th edition