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
Ag-Ab (antigen- antibody) reaction due to the presence of antibody at the surface of cell is: 
Select and explain. 
A. Type I hyp, B. Type II hyp, C. Type III hyp, D. Type IV hyp
A: Type I hyp
Answer: A: Type I hyp 
Explanation: None