This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Antigen-antibody reaction, Subject name: Microbiology
[{'content': 'Which is a example of antigen - antibody reaction- \nSelect and explain. \nA. Flocculation reaction, B. Precipitation, C. Agglutination, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., All of the above o Important antigen-antibody reactions in laboratory are:-i) Precipitation/Flocculationii) Agglutinationiii) CFTv) Neutrilization reaction", 'role': 'assistant'}]