Final answer:
In a newborn assessment, the nurse identifies spina bifida occulta through indications such as a dimple, birthmark, or hairy patch above the spinal defect. Spina bifida occulta is less severe than other forms and usually does not affect the spinal cord or nerve function.
Step-by-step explanation:
The nurse should identify Option A as an image of spina bifida occulta. This mildest form of spina bifida is characterized by external indications such as a dimple or a birthmark, and sometimes a hairy patch over the defect. Although the vertebral bones do not fully surround the spinal cord, the spinal cord itself is typically not affected, which often results in no functional differences, and hence the condition is 'occulta' or hidden.
Spina bifida occulta differs significantly from the more severe types such as meningocele and myelomeningocele, which involve the formation of a cystic protrusion at the defect site and can result in severe neurological symptoms. Moreover, folate supplementation during early pregnancy is essential to prevent the risk of neural tube defects like spina bifida.