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
The Weil-Felix reaction is: 
Select and explain. 
A. Precipitation, B. Agglutination, C. CFT, D. Immunoasay
B: Agglutination
Answer: B: Agglutination 
Explanation: Agglutination