This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'The reaction that occurs when antibody and soluble antigen are mixed is demonstrated by the \nSelect and explain. \nA. Agglutination test, B. Precipitin test, C. Hemagglutination test, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In precipitation test, antibody combines with soluble antigen. While in agglutination test, antibody combines with insoluble antigen', 'role': 'assistant'}]