Partial lack of neural tube closure leads to which condition

Pick the best answer out of the choices
1) spina bifida occulta
2) spina bifida cystica
3) anencephaly
4) holoprosencephaly

This was from a practice test. I thought that it would be BOTH anencephaly (failure of closure at rostral end) and spina bifida (failure of closure at caudal end) so I have no idea which one is the correct answer. Can anyone help?

Is the neural tube correctly closed in spina bifida occulta as my teacher said that it's due to the failure of 1-2 vertebra to close?

I don't think there's one correct answer here and I'm a neurologist. The only one of those answers I WOULDN'T think was correct is number 4.

All three of the other answers are conditions involved with defects in the neural tube. SBO doesn't usually result in obvious pathology because the spinal cord itself is usually intact, and anencephaly might be thought of as a complete failure to close rather than a partial one, leaving the 'correct' answer as #2. But that's pretty ridiculous.

I'd be curious what the correct answer is supposed to be, too...I'm wondering if the question wasn't really supposed to be "which of these conditions is NOT caused by a lack of neural tube closure".

The classic answer for nursing school texts and for medical assistants is:

1. spina bifida occulta

but I agree with Marie the neurologist, and yourself. This is a poorly written question and in fact, penalizes the student for knowing more than the course material to that point has taught. Best wishes.