This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Platelet, Subject name: Pathology
[{'content': 'Blood group antigens chemically are made up of ? \nSelect and explain. \nA. Carbohydrate, B. Glycoprotein, C. Phospholipids, D. Polysaccharide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Blood group antigens (ABO) Made up of glycoproteins. Expressed on the surface of RBCs and Platelets.', 'role': 'assistant'}]