What is the most frequently occurring permanently disabling birth defect, characterized by an abnormal opening in the spinal column?

• A. spina bifida
• B. cerebral palsy
• C. muscular dystrophy
• D. multiple sclerosis

Answer: (A)

This question centers on a congenital spinal defect and its lifelong impact. Spina bifida is a birth defect in which the spine does not fuse completely during early development, leaving an abnormal opening in the spinal column. Because it involves the structure of the spine and nerves, it can lead to lasting disability. It is often cited as the most frequently occurring permanently disabling birth defect when all severities are considered. The other conditions mentioned don’t fit this specific description: cerebral palsy is a movement disorder caused by brain injury around birth or early life, not an opening in the spine; muscular dystrophy is a genetic disease affecting muscles rather than the spine; and multiple sclerosis is an autoimmune disease that typically manifests later and involves demyelination of the central nervous system, not a congenital spinal defect. So spina bifida best matches the description.