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: Medicine
Mediastinoscope can be visualize all of the following lymphnode except ? 
Select and explain. 
A. Right paratracheal lymphnode, B. Aorto pulmonary window lymphnode, C. Anterior tracheal, D. Subcarinal
B: Aorto pulmonary window lymphnode
Answer: B: Aorto pulmonary window lymphnode 
Explanation: None