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
A patient with Miller Dieker syndrome on neuroimaging showed a smooth coex with no involutions. This condition of the brain where the convolutions are absent is called? 
Select and explain. 
A. Holoprosencephaly, B. Lissencephaly, C. Rachischisis, D. Arhinencephaly
B: Lissencephaly
Answer: B: Lissencephaly 
Explanation: Smooth cerebral coex with no convolutions is called Lissencephaly. It may be associated with microcephaly, developmental delay, seizure, optic nerve hypoplasia and microphthalmia. Holoprosencephaly means a single sphered brain. Rachischisis is congenital fissure of veebral column. Ref: Oxford Handbook of Clinical Specialities, Edition 8, Page - 139