This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'Large antigen-antibody complexes are formed in - \nSelect and explain. \nA. Prozone, B. Postzone, C. Zoneof equivalence, D. Noneof the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Zone of equivalence o Maximum lattice formation (antigen-antibody complex formation) occurs in zone of equivalence.", 'role': 'assistant'}]