Answer:
A
Explanation:
Always clarify with the doctor who wrote the order. The other options are subjective. 
 
        
             
        
        
        
The glial cells forming myelin sheaths are called oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system. The gaps (approximately 1 micrometer wide) formed between myelin sheath cells long the axons are called Nodes of Ranvier. 
hope this helps :p
        
             
        
        
        
Answer: weed
Explanation: hope this helps!