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: Pathology
[{'content': 'Ag-Ab (antigen- antibody) reaction due to the presence of antibody at the surface of cell is: \nSelect and explain. \nA. Type I hyp, B. Type II hyp, C. Type III hyp, D. Type IV hyp', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]