Which characteristic is NOT associated with Multiple Sclerosis?

Multiple Sclerosis (MS) is a neurological disorder characterized primarily by the autoimmune destruction of the myelin sheath surrounding nerve fibers in the central nervous system. This demyelination leads to a variety of neurological symptoms, including paresthesia (tingling or abnormal sensations) and gait abnormalities, which are commonly observed in individuals with MS.

The characteristic of heredity being a primary cause is not well-supported in the context of MS. While there is some evidence suggesting that genetic factors may contribute to the risk of developing MS, it is not considered a primary cause. MS is primarily viewed as an autoimmune disease, wherein the body's immune system mistakenly attacks its own myelin, leading to the symptoms associated with the condition. This immune response is mediated by B-cells and other components of the immune system.

Thus, the aspect of heredity being a primary cause does not align with the established understanding of MS, where autoimmune mechanisms play a more significant role than direct genetic inheritance. Therefore, it is accurate to identify heredity as not being a definitive or primary characteristic associated with Multiple Sclerosis.