This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen & Pelvis, Subject name: Anatomy
Choose the appropriate lettered structure in this CT scan of the abdomen at the level of the 12th thoracic vertebra. Which structure is divided into the proper hepatic and gastroduodenal arteries? 
Select and explain. 
A. A, B. B, C. C, D. D
A: A
Answer: A: A 
Explanation: (a) The common hepatic artery is divided into the proper hepatic and gastroduodenal arteries.