system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following is true about right principal bronchus?
assistant
The correct answer is  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