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
Which of the following is the most cranial structure in the root of the left lung? 
Select and explain. 
A. Pulmonary artery, B. Bronchus, C. Pulmonary vein, D. Bronchial artery
A: Pulmonary artery
Answer: A: Pulmonary artery 
Explanation: pulmonary artery is seen in upper part of left lung root.