This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Antigen presenting cells are- 
Select and explain. 
A. Langerhans cell, B. Macrophage, C. Cytotoxic T cells, D. Helper T cells
A: Langerhans cell
Answer: A: Langerhans cell 
Explanation: Robbins basic pathology 6th edition. Chapter diseases of immunity. langerhan cells are antigen presenting cells.