This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Which of the following is a flocculation test - 
Select and explain. 
A. Widal test, B. Weil - felix test, C. VDRL, D. Paul - Bunnel test
C: VDRL
Answer: C: VDRL 
Explanation: The VDRL test fur syphilis is an example of slide flocculation. When a drop each of the antigen and the antiserum are placed on a slide and mixed by shaking, floccules appear. Reference:Anathanarayan & paniker's 9th edition, pg no: 106 <\p>