Which among the following glial cells helps form the myelin sheath in the Central Nervous System (CNS)?

Examine the following statements: Assertion (A): Increased activation of brain cells in the cerebellum is associated with enhanced motor coordination and learning. Reason (R): The cerebellum plays a crucial role in fine-tuning motor movements, balance, and posture by integrating sensory inputs. Choose the correct option:

Given below are two statements regarding the olfactory system, one labeled as Assertion (A) and the other as Reason (R): Assertion (A): The olfactory bulb is a structure located at the end of the olfactory tract that receives sensory input directly from olfactory receptor neurons. Reason (R): Olfactory glomeruli are specialized ball-like structures within the olfactory bulb containing synapses between the terminal buttons of olfactory receptor axons and the dendrites of mitral cells. In light of the above statements, choose the correct answer: