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: Microbiology
[{'content': 'MHC class 1 proteins are not present on \nSelect and explain. \nA. Platelets, B. RBC, C. T-cells, D. Macrophage', 'role': 'user'}, {'content': 'Answer: B \nExplanation: MHC class 1 proteins are present on all nucleated cells and platelets.', 'role': 'assistant'}]