This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of lipid, Subject name: Biochemistry
Which of the following is not a phospholipid? 
Select and explain. 
A. Lecithine, B. Plasmalogen, C. Cardiolipin, D. Ganglioside
D: Ganglioside
Answer: D: Ganglioside 
Explanation: Gangliosides are more complex glycosphingolipids containing more sugar residues plus sialic acid. They are present in the outer layer of the plasma membrane, where they contribute to the glycocalyx and are impoant as antigens and cell receptors.Ref: Harper&;s Biochemistry; 30th edition; Chapter 40 Membranes: Structure & Function