This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemistry of Lipids, Subject name: Biochemistry
Which of the following is not a product of complete hydrolysis of Sphingomyelin? 
Select and explain. 
A. Choline, B. Phosphate, C. Ceramide, D. Palmitic acid
C: Ceramide
Answer: C: Ceramide 
Explanation: Sphingomyelin is made up of sphingosine alcohol, one fatty acid, one phosphate, and one choline. So, sphingosine alcohol, one fatty acid, one phosphate, and one choline are products of complete hydrolysis of sphingomyelin. This fatty acid can be palmitic acid. So palmitic acid can be a product of complete hydrolysis. But Ceramide = Sphingosine + Fatty acid. So ceramide CANNOT be a product of complete hydrolysis. It's is a product of paial hydrolysis.