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
Prozone phenomenon is due to:- 
Select and explain. 
A. Antigen excess, B. Antibody excess, C. Excessive immune complex, D. Acute phase reactants
B: Antibody excess
Answer: B: Antibody excess 
Explanation: 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