This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Which of the following is complete sulcus 
Select and explain. 
A. Lunate, B. Calcarine, C. Colluteral, D. Central
C: Colluteral
Answer: C: Colluteral 
Explanation: Complete sulcus is very deep so as to cause elevation in the walls of the lateral ventricle. Examples are the collateral and calcarine sulci. Incomplete sulci are superficially situated and are not very deep, E.g. paracentral sulcus. Ref- sciencedirect.com