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': 'Agglutination test is - \nSelect and explain. \nA. ABO incompatibility, B. VDRL, C. Weil-felix test, D. FTA-ABS', 'role': 'user'}, {'content': "Answer: C \nExplanation: Weil- Felix reaction for the diagnosis of typhus fever. - The Agglutination reaction is when a paiculate antigen is mixed with its antibody in the presence of electrolytes at a suitable temperature and pH, the paicles are clumped or agglutinated. Reference : Anathanarayan & paniker's 9th edition, pg no: 108,109 <\\p>", 'role': 'assistant'}]