This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Haemophilus, Yersinia, Spirochaetes, Ricketssia, Chlamydia, Mycoplasma and Miscellaneous Bacteria), Subject name: Microbiology
VDRL is an example of - 
Select and explain. 
A. Slide agglutination, B. Tube agglutination, C. Slide flocculation, D. Tube flocculation
C: Slide flocculation
Answer: C: Slide flocculation 
Explanation: The Veneral Disease Research Laboratory test (VDRL) is a non-specific test for syphilis and it is a slide flocculation (precipitation) test.