Sarah Is a 20-Year-Old College Student Who Is Paralyzed from the Waist

Sarah is a 20-year-old college student who is paralyzed from the waist down. She can walk with difficulty using crutches but prefers her wheelchair. Sarah's condition is due to a birth defect that occurs when the neural tube fails to close during gestation. Which of the following birth defects does Sarah most likely have?

A) anencephaly
B) neuronal migration
C) multiple sclerosis
D) spina bifida

Correct Answer:

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