This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Bank & Transfusion Therapy, Subject name: Medicine
[{'content': 'Carbohydrate related to blood grouping? \nSelect and explain. \nA. Arabinose, B. Xylulose, C. Xylose, D. Fucose', 'role': 'user'}, {'content': 'Answer: D \nExplanation: H antigen is present on the surface of RBC H antigen is related to sugar FUCOSE H antigen (Fucose) + N- acetyl galactosamine A H antigen (Fucose) + Galactose B H antigen (Fucose) + Both AB H antigun (Fucose) - Both O MC Blood Group = O+ Rarest Blood Group = Oh-ve (Bombay Blood group)', 'role': 'assistant'}]