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
Which impoant component of cell wall has carbohydrate moiety: 
Select and explain. 
A. Phosphoglyceride, B. Triacylglycerol, C. Sphingomyelin, D. GM2 Gangliosides
D: GM2 Gangliosides
Answer: D: GM2 Gangliosides 
Explanation: D i.e. GM2 GangliosidesGlycolipids are widely distributed paicularly in nervous tissue as brain. They occur paicularly in outer plasma membrane where they contribute to cell surface carbohydrateQ