The neurological cells that form a myelin sheath around axons are

Oligodendrocytes are neurological cells and are part of the Central Nervous System that forms myelin sheath around the axons. They provide insulation to the axons having the same function of Schwann cells located in the Peripheral Nervous System which is also a part of the nervous system.

Can you list the drugs that you want answered for? i think maybe your answer could be a or b. but i’ll never know till you post the rest of this question.