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: Physiology
[{'content': 'True about ABO blood group antigen: \nSelect and explain. \nA. Found on RBC membrane, B. Glycprotein in nature, C. Highly immunogenic, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A, B, C i.e. Found on RBC membrane; Glycprotein in nature; Highly immunogenic', 'role': 'assistant'}]