This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
Which of the following is true about right principal bronchus? 
Select and explain. 
A. Sho and thin, B. Sho and broad, C. Long and broad, D. Long and thin
B: Sho and broad
Answer: B: Sho and broad 
Explanation: The right main bronchus (or right primary bronchus, or right principal bronchus), wider, shoer, and more veical in direction than the left, is about 2.5 cm. long, and enters the right lung nearly opposite the fifth thoracic veebra. The azygos vein arches over it from behind; and the right pulmonary aery lies at first below and then in front of it