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: Biochemistry
[{'content': 'Gangliosides consists of \nSelect and explain. \nA. Long chain fatty acid (LCFA), B. Alcohol-sphingosine, C. Sailic acid, D. All of these', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ganglioside = ceramide + oligosaccharide chain (e.g. glucose + galactose) + sialic acid (N-acetylneuramic acid).\n\nor\n\nGanglioside = sphingosine + long chain fatty acid + oligosaccharide chain + sialic acid (NANA).', 'role': 'assistant'}]