Answer:
folic acid
Step-by-step explanation:
Spina bifida is a type of neural tube defect that occurs as a result of the inability of the spine and spinal cord to form properly in children. The major nutritional deficiency that results in it is an insufficiency of folic acids in the diet of the pregnant mother and fruits and vegetables are natural rich sources of folic acid. Hence, since it is winter and there are no fruits or vegetables, folic acids may be lacking in the diet of Huang and to compensate for this so as to prevent giving birth to a child with spina bifida, it is advised that she takes folic acid supplements daily.