Sphingomyelins are a major component of the myelin sheath. Damage to the myelin sheath results in such diseases as multiple sclerosis. Which compound below corresponds to a sphingomyelin? 
Definitions:
Conversation
A form of interactive, spontaneous communication between two or more parties.
Nonverbal Communication
The process of conveying a message without the use of words, through body language, facial expressions, and gestures.
Personal Space
The physical area surrounding an individual that they consider their own, into which others cannot intrude without causing discomfort.
Eye Contact
The act of two people looking directly into each other's eyes, which can communicate various emotions and intentions.
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