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
[{'content': 'HLA-I is present on \nSelect and explain. \nA. All nucleated cells, B. Only on cells of immune system, C. Only on B-cells, D. Only on T-cells', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Harshmohan textbook of pathology 7th edition. *HLA system composed of antigenic proteins present on all nucleated cells of the body and platelets.', 'role': 'assistant'}]