試題詳解

21. Spina bifida leads to various symptoms, such as abnormalities in walking, leg weakness, or bladder control issues, and what is its primary cause?
(A) An incomplete closure of the spinal column.
(B) An abnormal opening in the abdominal wall.
(C) A congenital heart defect affecting the aorta.
(D) A genetic disorder causing abnormal limb development.
(E) A muscle defect due to abnormal function in mitochondria.