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
HLA-I is present on 
Select and explain. 
A. All nucleated cells, B. Only on cells of immune system, C. Only on B-cells, D. Only on T-cells
A: All nucleated cells
Answer: A: All nucleated cells 
Explanation: Harshmohan textbook of pathology 7th edition. *HLA system composed of antigenic proteins present on all nucleated cells of the body and platelets.