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
Antigen-presenting cells are all except: 
Select and explain. 
A. M-cells, B. Macrophages, C. Langerhans cells, D. Thymocytes
D: Thymocytes
Answer: D: Thymocytes 
Explanation: Ans: D. Thymocytes(Ref Robbins 9/e p625, 788)Immature T lymphocytes of thymus are called thymocytes. Thymic epithelial cells are antigen presenting cells (Non!professional) but not thymocytes."M-cells or microfold cells are a pa of GALT (gut associated lymphoid tissue) and an antigen presenting cells in intestine."Classical APCs include dendritic cells, macrophages, Langerhans cells and B cells.