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
[{'content': 'VDRL is a - \nSelect and explain. \nA. Slide flocculation test, B. Tube floccolation test, C. Gel precipitation test, D. Indirect haemagglutination test', 'role': 'user'}, {'content': "Answer: A \nExplanation: The VDRL test for syphilis is an example of a slide flocculation test. 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>", 'role': 'assistant'}]