Which of the following best describes the waxy-appearing material called myelin

Q. Which of the following best describes the waxy-appearing material called myelin?

1. an outermembrane on a neuroglial cell
2. a lipid-protein (lipoprotein) cell membrane on the outside of axons
3. a mass of white lipid material that surrounds the cell body of a neuron
4. a mass of white lipid material that insulates the axon of a neuron
5. a mass of white lipid material that surrounds the dendrites of a neuron

Answer: a mass of white lipid material that insulates the axon of a neuron