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
[{'content': 'Antigen presenting cells are all of the following EXCEPT:- \nSelect and explain. \nA. Astrocytes, B. Endothelial cells, C. Epithelial cells, D. Langerhans cells', 'role': 'user'}, {'content': 'Answer: A \nExplanation: . Astrocytes', 'role': 'assistant'}]