This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure and function of protein, Subject name: Biochemistry
[{'content': 'Gangliosides consist of \nSelect and explain. \nA. Nitrogenous base, B. Glycerol, C. Phosphate, D. Sialic acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Gangliosides are synthesized from ceramide by the addition of activated sugars (eg, UDPGlc and UDPGal) and a sialic acid, usually N-acetylneuraminic acid. Gangliosidoses is accumulation of gangliosides. Ex: Tay-Sachs disease Ref : Biochemistry by U. Satyanarayana 3rd edition Pgno : 37', 'role': 'assistant'}]