This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Widal test is a type of? 
Select and explain. 
A. Tube agglutination, B. Slide agglutination, C. Tube precipitation, D. Slide precipitation
A: Tube agglutination
Answer: A: Tube agglutination 
Explanation: Ans. (a) Tube agglutinationRef: Textbook of Microbiology by Ananthanarayan and Paniker / 299