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: Radiology
According couinaud's classification of functional segments of liver, which of the following is segment IV of liver? 
Select and explain. 
A. Left lobe, B. Right lobe, C. Caudate lobe, D. Quadrate lobe
D: Quadrate lobe
Answer: D: Quadrate lobe 
Explanation: Segment I     →  Caudate lobe
Segment IV   → Quadrate lobe