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: Anatomy
Arrangement of cerebellar grey matter is called ? 
Select and explain. 
A. Folium, B. Arbor vitae, C. Declive, D. Culmen
B: Arbor vitae
Answer: B: Arbor vitae 
Explanation: The gray matter of cerebellum is highly folded to accommodate millions of neurons in a small area.This arrangement is called arbor vitae (vital tree of life).