This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2018, Subject name: Microbiology
[{'content': 'Prozone phenomenon is due to:- \nSelect and explain. \nA. Antigen excess, B. Antibody excess, C. Excessive immune complex, D. Acute phase reactants', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most of the antigen antibody reactions occurs in three phases. Zone of antibody access- Prozone phenomenon Zone of equivalence- Lattice formation and visible reactions are enhanced. Zone of antigen excess- Post zone phenomenon', 'role': 'assistant'}]