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
Postzone phenomenon is seen in ? 
Select and explain. 
A. Antigen excess, B. Antibody excess, C. Equivalance zone, D. None of the above
A: Antigen excess
Answer: A: Antigen excess 
Explanation: Ans. is 'a' i.e., Antigen excess Postzonc phenomeno - Antigen excessProzone phenomenon - Antibody excess