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
Widal test is an example of.......... Test.: 
Select and explain. 
A. Flocculation, B. Agglutination, C. Both, D. None of the above
B: Agglutination
Answer: B: Agglutination 
Explanation: Agglutination