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
[{'content': 'Which of the following is the most impoant antigen-presenting cell (APC) for initiating T-cell response against protein antigens? \nSelect and explain. \nA. NK cell, B. Dendritic cell, C. Macrophage, D. B-lymphocyte', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.', 'role': 'assistant'}]