This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Delayed neuronal migration and organization leads to ceain disorders. Which of the following is the least likely possibility? 
Select and explain. 
A. Lissencephaly, B. Schizencephaly, C. Polymicrogyria, D. Focal coical dyplasia without balloon cells
D: Focal coical dyplasia without balloon cells
Answer: D: Focal coical dyplasia without balloon cells 
Explanation: Ans. d. Focal coical dyplasia without balloon cells (Ref http://enm kipedia.org/wiki/Neuronal migration_ disorder)Delayed neuronal migration and organization leads to ceain disorders. Least likely possibility is focal coical dyplasia without balloon cells