This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Basic Concepts, Subject name: Pathology
Which of the following is the most impoant antigen-presenting cell (APC) for initiating T-cell response against protein antigens? 
Select and explain. 
A. NK cell, B. Dendritic cell, C. Macrophage, D. B-lymphocyte
B: Dendritic cell
Answer: B: Dendritic cell 
Explanation: Naive T cell get activated by antigen presenting cells such as Dendritic cell Macrophage B-lymphocyte Most impoant APC in activating naive T cell is dendritic cell.