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
Prozone phenomenon is due to- 
Select and explain. 
A. Excess antigen, B. Excess antibody, C. Hyperimmune reaction, D. all
B: Excess antibody
Answer: B: Excess antibody 
Explanation: Ans. is 'b' i.e., Excess antibody