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: Unknown
Which of the following is true about right principal bronchus 
Select and explain. 
A. Short and thin, B. Short and broad, C. Long and broad, D. Long and thin
B: Short and broad
Answer: B: Short and broad 
Explanation: The right main bronchus (or right primary bronchus, or right principal bronchus), wider, shorter, and more vertical in direction than the left, is about 2.5 cm. long, and enters the right lung nearly opposite the fifth thoracic vertebra.
The azygos vein arches over it from behind; and the right pulmonary artery lies at first below and then in front of it