This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Major histocompatibility complex class 1 is seen on which of the following cells \nSelect and explain. \nA. Macrophage only, B. All body cells, C. B cell only, D. All blood cells except erythrocytes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Robbins 9/e p205 MHC class I molecules are one of two primary classes of major histocompatibility complex (MHC) molecules (the other being MHC class II) and are found on the cell surface of all nucleated cells in the bodies of jawed veebrates. They also occur on platelets, but not on red blood cells.', 'role': 'assistant'}]