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
[{'content': 'Which of the following is complete sulcus \nSelect and explain. \nA. Lunate, B. Calcarine, C. Colluteral, D. Central', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]